Counter points:

On lemmy, using something like thunder or some other client that integrates with a wide swath of the lemmyverse and other things its connected to, you can easily join or leave not just subreddits, but different lemmy instances, which at this stage are often defined by userbases that sometimes have a broad consensus of opinion on certain things, but sometimes dont.

Point 2: Maybe I missed this in reddit, but again using something like thunder, its not too hard to just block people who you witness demonstrate commitment to hive mindedness either in absurd, barely relevant scenarios, or in cases where its obvious the commitment to the hivemind opinion flies in the face of the actual facts of a discussion, or they demonstrate irrationally charged responses to only certain topics which are at best tangentially related to their hivemind triggers, or in cases where their hivemind triggers cause them to misread what was actually typed, assume malice, become irrational, and then refuse to back down after clarification.

Yes this is far from an ideal solution to the hive mind / echo chamber problem, but at least as I am aware, it is /something/ you can do to mitigate the problem, at least for yourself personally, that you cannot do on reddit.

Again though, as reddit has been a sad parody of human discussion for a while now, i have not used it much and may have missed it if you can basically twitter style completely block people entirely from you being able to see them at all, at a client, instead of subreddit moderator level.

EDIT:

To think that you can have a large, popular, diverse interaction with other humans, basically fancy, large forum on the internet without this also including large numbers of people with opinions or rhetoric you personally find objectionable, or who are very confident and very uninformed, is delusionally absurd, any actual objective analysis of the history of basically any large social media app or site or large internet community of basically any kind would evidence this.

This is why i like the blocking ability. Puts power in the hands of the user themself to define their experience.

Is it perfect? Obviously not. Is it better than not being able to do this? Obviously yes.

Can biased people who themselves are very hive mindy use this to put themselves into echo chambers? Yes. It certainly does not solve that problem.

But it does at least allow for more level headed users to choose who they engage with and personally make the call of, ok, this person is wrong, but not in an insane way, maybe theyre worth talking to or seeing further comments/posts from them, vs, nah, this person is obviously toxic and if i dont ban people like that, i am going to suffer mental health problems from seeing deragned nonsense all the time.

Again, anyone whose been in any other large internet community for a while knows that mods are very often lazy, biased, and fall into personal popularity cults / dream worlds, and cannot generally be trusted to be objective, nor reasonably expected to be in a large community where they are basically volunteers, presumably with actual lives and responsibilities when afk.