So here is an experiment:
I created a copy on the web in my SOLID POD from the arXiv-vanity HTML rendering:
https://froehlichmarcel.inrupt.net/public/c6af4829-a1fb-463e-b1b2-b94f27c79ce5
I propose to use http://hypothes.is (browser plugin) to add collaborative comments on this paper, directly. Go!
Having discussions tied to the document discussed, instead of in threads on Twitter or Mastodon, helps consolidate the conversation and keep it off notification channels, which are less than ideal for this purpose.