Very good outline! You made a good pitch for Tiddlywiki as well.
I'm into the Roam rabbit hole since january and am very pleased with the direction it went. Some of your close-miss criteria are also being addressed: Offline is coming soon, loading times are now very fast, API/mobile is on the horizon as well and since payments turned on, I'm not really worried about the longevity of the platform. I can't comment on the LaTeX though, but the very powerful transclusion based on the freely query-able block structure of the whole database is just...very very nice. Plus, the community is being crazy active with web-clippers, addons, very powerful CSS mods etc.
To briefly share mine: