People consider vegans on Lemmy as too preachy. Even in vegan communities here, mods have to remove soooo many inappropriate comments (I read a few of these and they keep getting removed for good reasons). Comments that suggest going vegan on posts about animal abuse are downvoted.
At the same time, whenever there is something about Windows or Chromium based browsers, people here are doing exactly the same. “Just use Linux/Firefox/whatever”.
Vegan is a tradeoff. Replacing highly bioavailable food with lectins and other things. It can be done in a healthy way, but there is lots of nuance and discussion and it’s a deeply personal choice.
Just because people agree on the tradeoffs of one thing, doesn’t mean they agree with the tradeoffs of another.