First of all that's Dorian Nakamoto. We really don't know what he/she/they looks like.

Second, I don't think that Satoshi will change anything on his invention, let me quote him

The fact that it has been 10 years already and we have no single clue who he/they were is a sign that they wouldn't be seen nowadays. And I don't think they will still going to show in another coming years like 20 years or so. They choose to stay hidden after all of this that happen to crypto community.

I don't know why you want Bitcoin to change so much but let's just accept what Satoshi offered by his knowledge that we are using today.

call it curiosity.My query is your thoughts on the Perfect Bitcoin. I am certain Satoshi would have some alterations . Would have some tweek or adjustment . Being the first has its downfalls. You become the example of what to do and what not to. Be  Satoshi for a bit if you can spare the time. Ask yourself what is the Perfect Bitcoin?

Yeah, probably scalability will be one area that Satoshi are going to improved because he didn't see that his invention will grow so big like this. But the good thing is that there are devs who contributed to the bitcoin core so I would say that we are in good hands.

LN is one solution to help mitigate the problems of scalability, although that yet wildly adopted, but for sure Satoshi will go and focus if he want's a "perfect bitcoin".

Nothing. Because Satoshi created a currency to be ran by the community, not solely by him. He/she/they definitely knows that what Bitcoin should be is what consensus thinks it should be.

Personally, the challenge that Bitcoin currently faces is actually derived from Ethereum. If Satoshi Nakamoto was a real person rather than a robot that traveled from the future. He may not have thought that there are countless public chains appearing on the market now, such as ETH and BSC, whose functionality has far exceeded the BTC chain. If I were Satoshi Nakamoto, it might be a better solution to study a method to connect various public chains together in a decentralized way.

A self adjusting block size based on the number of transactions (with payment) could have been better. Satoshi knew about the energy usage and limited block size, and yet still kept these in. These will prevent bitcoin from being established as a daily 'currency', despite having incredible computing power behind it. They push it towards a unit of large value though with slower growth, so that may have been the point.

The mining reward stopping in 2140 may kill off bitcoin at that time. I would change the mining reward to continue forever, although decreasing at a different rate after 2140.

It was the first and had yet to be established as a viable method, so there would be improvements to be made.

My Perfect Bitcoin
Proof of Stake with a 30 second block speed
~37 billion coins
All Transactions at a fixed rate
All Transactions Processed Sequentially
An extremely low interest rate 5% or lower 
All Transaction fees destroyed to offset new coins created.
No smart contracts feature to avoid blockchain bloat
 

I'm sure if he's alive and a person, he wouldn't change much of what's actually going on, except would be proud and glad of what he has done and how his project became one of the most successful project of the world in his history. If he is aware of this movement, I'm sure in night he sleeps at peace knowing how much power he has brought back to the hand of people snatching it away from the government and evil who took it from us!

Bitcoin is quite revolutionary but just like any man-made invention there is nothing that is really perfect especially in the light of the present circumstances we are in. I am more focusing on the energy requirement for mining Bitcoin which is we know can be so huge that many people are questioning its viability and contribution to environmental degradation. I know that compared to other industries, Bitcoin is not actually that bad but then again it can be better if a different technology can be utilized by Bitcoin in mining so that power requirement can be lessened dramatically.