Hobby level “echo-chambers” have never been a problem, eg. kitting will likely have a balanced political view. Problematic groups are the ones that have nothing else but a very specific ideology as a common point, eg. r/conservative or the like (as well as the left-leaning counterparts) — occasionally viewing them is not bad imo, if one spends sufficient time in other places as well. The problem is when somebody wants to spend all of their time there, shutting off any alternative source of information.