bitcoin is not deposited into LN.. bitcoin never leaves the bitcoin network
Your first statement is wrong, the second one is true. This is no contradiction, because LN and Bitcoin aren't "separate". LN nodes are also Bitcoin nodes.
There is of course LN-specific data exchanged between LN nodes that does not touch the rest of the Bitcoin nodes, but that's the whole point: LN exists to make it possible to limit the data exchange about a group of Bitcoin (!) transactions to a subnetwork. It is there to
prevent all Bitcoin nodes
having to know about these transactions.
(I put these three words into italics because they can be misunderstood: Every Bitcoin node who wants it can of course be a LN node too. But if he doesn't want to, he shouldn't have to bother about LN transactions.)
as for the LN balance that goes back and forth and renegotiated.. they certainly can double spend the UTXO reference across multiple channels. there is no network wide audit in LN(as for who eventually gets to win that actual amount at settling.. only one will and it may not be your rented channel/temp channel)
That's FUD. An attacker can try that, yes. That's LN's drawback, that you have to actively monitor the channels you have open, but if you are entitled to own a certain balance according to LN rules and the network operates correctly (again: no discussion about bugs if we talk about the concept) then you can always challenge this attack attempt. If you try to use double spending the HTLCs and RSMCs have timelocks long enough that every attempt can be challenged.
You can call the UTXO reference "credit limit" if you want, and the LN transactions "debt", if you like to insist on these technicalities. The fact that they don't share almost nothing with conventional debt in the fiat system remains.
LN didnt function via just punishments but now needs things like "watch towers" and other third parties
That was quite clear from the start on. And if you monitor your channels actively you don't need watchtowers.
i want bitcoin(btc) to scale, with multiple dev teams, multiple node brands with equal power but no absolute central power, all offering proposals where the best proposals moves forward by devs listening to the community needs to provide the best solutions that everyone can then agree on using real consensus(consent of the masses) and applying those features to all brands to move forward(no single solo controlling brand)
Either that is already the case (everybody can create a bitcoin client with its own rules, the question is if miners and economic nodes use it ...) or you want take the "several brands" approach to the extreme nobody knows what the Bitcoin protocol actually is.
Let's get honest: you want big blocks to be enabled (and are still angry that in 2017 the decision didn't play out like you wanted) that's all

LN's function does not 100% require a bitcoin node.. so lets make that clear
LN is not bitcoin, people can use LN using different mainnets.. so lets make that clear
also LN channels can be set up without needing a bitcoin UTXO.. so lets make that clear
bitcoin isnt deposited into LN, its collateralised and locked on bitcoin.. so lets make that clear
a bitcoin utxo can be used as a reference for many networks, not just LN.. so lets make that clear
LN does not have a network wide audit to ensure a utxo is solely used just for a specific LN channel/network.. so lets make that clear
much like old UTXO of bitcoin is not deposited into a fork/altcoin, even if used as reference in other networks payments..so lets make that clear
also people need to leave their house, go see friends/relatives, take vacations, sleep, so cant monitor constantly.. so lets make that clear
LN can operate without users forming a multisig to lock both parties into controling the credit before, during and at settlement.. lets make that clear
there are LN institutions with utxo that are 2-3 years old 'renting' balance to users that just arrive this year, this alone should emphasise enough how users are not in full control or part of a multisig of 50% control of funds to enforce compliance to any punishments. the true utxo owner can just self RBF his own tx and take what he wants completely separate to what the other person thinks they will get even with what they think includes a punishment
stop trying to describe LN using its "best-case" scenario.. as thats just a limited utopian fluffy cloud view of how LN actually operates. instead flush away the false promise utopian dream promotion ideals. and instead be properly and openly critical about all financial systems to ensure people know the risks they are getting into when using such systems. dont sound like a snake oil salesman as that makes you look bad in the end by avoiding the more accurate view of the issues people do and have experienced aswell as the issues even LN devs admit are possible
and no your definition of "big blocks" vs my opinions of what scales bitcoin differ. so lets make that clear. there are many ways to scale bitcoin that do not form your extremist view of how you perceive "big blocks" and lets not then use the stupidity narrative of pidgeon holing anyone that doesnt like the core roadmap as "big blockers" as that stupidity makes you look stupid
the only thing i can say about your post is atleast you sucked up and complied to the doomad rhetoric and earned your merit from him.. thats obvious.. but he wont refund you when things go wrong. so think more about risk assessment, transparency and risk mitigation rather than doomad rhetoric recruitment campaigns of ignoring the risks