IMHO Bitcoin is good as it is right now, I don't understand why people look for perfection here. Bitcoin works, I'm using it without problems since 2010
It still works fine as a payment system. But it is no longer a
decentralized trustless payment system -- because 80% of the mining is done by 6 companies, of which 4 are Chinese and 1 is Ukranian-Georgian.
One cannot notice that detail, but those attributes were what made bitcoin different and worthwhile. Without them, it is just another centralized payment system -- and a terribly slow, complicated, expensive, unreliable, limited, understaffed, and insecure one.
It is like a Tesla whose electric engine has been replaced by a gasoline one. It still works fine, but...