I do wish more people saw it that way. Imagine you are satoshi. You've just designed a revolutionary new peer-to-peer protocol, where Person A can send funds to Person B without any intermediaries blocking the transaction, freezing funds, harvesting user data, etc. And then the first thing people do with it is introduce middlemen who do all of those terrible things and more. Wouldn't you be disappointed/annoyed/saddened by that?
I've said it a few times, if Satoshi is dead he for sure had died a few more times from rolling in his grave.
That aside, there is a tiny difference here, Satoshi would be probably mad if you would use an intermediary to pay with Bitcoins, such a coinbase or Binance account, but if we talk strictly about buying and selling bitcoins for $ there is little alternative to a third party. Oh, you don't use Binance you sue Bisq, but you still get your fiat in a bank account, via WU, via Swish or any other payment method.
So if you're not going to use cash, you're still definitely going to use a 3rd party that for sure going to do all the above things you mentioned.
But again, despite what OP is claiming, people do this because! it's convenient and unless you find a way to do that p2p just as easily as pressing buy in an app where Gpay is autocompleting your cc details nothing is going to change, hundreds of innovations and companies have failed exactly because of this, we're in an age where everyone wants a tap and that's it, two taps maximum, once you ask them for a few extra steps it's bye bye.
Your analysis is sharp and powerful. You want Bitcoin's decentralization back.
Bitcoin has always been decentralized and will never be centralized.
If people want to use it like that they are free to do so, and not just you as I'm right now replying to more on this topic, you should not forget there are two things that are true at the same time:
"Not your keys, not your coins" but also "My coins, my decision"
Of course, it's not the outcome we would want, it's not making much sense but at the same time, but nothing is broken and the whole environment works just as planned, where everyone is making his moves as he wishes.