It might improve things marginally but at this point it's just an arm's race. Furthermore the people who will manage to work around these limitations will also probably be the more radicalized fringe of the community who are probably the most problematic one as well. It will deter the more moderate and give a larger audience to the radicalized.

Look at how people on Reddit, 4chan and elsewhere manage to identify Twitter accounts from anonymized screenshots in mere minutes in order to have a constructive discussion with the author.

I don't think technology can fix a community as large and diverse as Twitter, 4chan or Youtube. The problem IMO is that it's not even a community anymore, it's more like an amalgamation of thousands of communities with vastly different opinions and mindsets. You can try to isolate the communities as you propose and you end up with something like Reddit with mostly secluded communities. Look at how well it's working for them...

That's why I prefer smaller communities like Hacker News where there's still an actual sense of communities. We all see the same articles, we probably have vaguely similar interests etc... You don't default to assuming that whoever you're disagreeing with is a literal fascist/communist/whatever.