Exactly this. But there are a set of people who enjoy or feel the need to engage in combat with other schools of thought, either as validation or because of genuine desire to proselytize; and there is a subset of those people that believe that everyone should be forced into a single arena where the strongest ideas will prevail and thereby clearly delineate 'right' and 'wrong'. One of the major advantages of the Fediverse right now is that trying to do this is harder, plus there already are such arenas in the form of Twitter and Facebook. To me the complaint about 'bubbles' is usually from these believers in the school of trial by combat that are frustrated by their inability to impose this philosophy on the Fediverse. Which means it is working as designed...
> One of the major advantages of the Fediverse right now is that trying to do this is harder
Even in the Fediverse, I think these folks would just make their own instance. I wouldn't be surprised in the least if an instance was made to represent the "marketplace of discussion". I just wouldn't want to join it myself.
