The worst part about Discord is how nothing is indexed by search engines, so when you need help with something your only option is to join a Discord server and ask for help, or use the crappy search functionality.
I’ve seen Linen before, but haven’t found a community that actually uses it. It would be great to see it (or a similar alternative) take off in the software development world, where this type of thing is probably most impactful.
Edit: for a casual or private chat room, Matrix is probably better though
I love the Vita! It just feels so right in the hand, and the clicky d-pad/face buttons are the best. I like it so much that around a year ago I ported one of my favorite indie games to it.