I would be interested to know what you think is the biggest criticism of Bitcoin or where you see the biggest weakness?
The possibility of being manipulated by big players: the institutional investors and governments. If governments and big corporations own large portions of Bitcoin, they can drive this market upside down, as they are already doing. Bitcoin should be better distributed among more different hands of independent individuals, instead of belonging in large portions to governments' wallets and corporations.
In my view, that is the biggest weakness of Bitcoin. That is how the centralized parties subvert Bitcoin's initial purpose, which was to give more freedom and independency to common individuals who have never seen their interests satisfied by the groups of power which rule life in society.
Manipulating the price causes the price of Bitcoin to be lower than it should be. Having so much Bitcoin that you can manipulate the price is a negative situation for both the market and Bitcoin. There is no complete precaution that can prevent this situation. The fact that all states invest in Bitcoin and there is not much difference between investment amounts can prevent this situation to some extent, but it is very difficult to prevent it completely.
Bitcoin holders are not the only ones manipulating. Influencers or famous people whose words are listened to on social media can also do negative things that will affect the price. These are among the criticisms of the market and are very difficult to fix.