@design_RG well im not sure why being part of a on-topic instance gets you any more exposure to the community there. Several of the masto apps allow you to view the timelines of remote instances not just your own local one. As such you can view that timeline and interact just as if you were local to that instance.
I generally find interacting with people across instances is just as welcome as the local instance and dont find it to be a barrier.
I do understand your desire to seperate out your personas so you can say something in one instance with some degree of anonymity, and I can see why that would be appealing to some people, but I dont think it is the default for many of us, nor should it be unless you have a need for it.
I myself take a very different view, I dont try to get along with people or avoid touchy topics. I am trying to build a community of people who are mature and respectful so we can disagree on difficult and emotional topics and still get along and be friends, thats always been my goal. So that is a bit contrary to the need to keep topics aligned with ones own views to avoid conflict, in fact I want a space where we have many different views.
I think it may be just my nature. I despite at my core echo chambers, and would hate being in an environment that shares my political views or any other set of views. I want an environment where people disagree with me, actively, and we have impassioned debates where everyone still respects the other in the end.
I dont want to avoid the toxicity of twitter and other platforms, I want to cure it.