I always try to seek out arguments against bitcoin to find holes in my understanding of it and what large scale adoption (think USA making bitcoin legal tender like El Salvador) would mean for the world.
Also, it helps to know what opponents care about and how one can respond to such arguments in a reasonable manner (no "hfsp" or "ngmi" or the likes).
Further, I don't want this site to become a circle jerk where we all jerk each other off because we know more about bitcoin then the majority of people but don't actually care about all the implications.
So let me hear: what are the arguments against bitcoin which are the most reasonable and hardest to counter? Where we would maybe even agree, that this is indeed a problem and we still have to find a solution?
Chinese long game