Which is largely whether or not the eventual consistency model or not is the route to take. Is the resilience for chat worth the explosion of storage & preformance cost of sync/search & maintaining all that data amongst all servers? Or is limited/functional sync without always duplicating the entire history with the occasional out-of-order message & missing old attachment good enough? Is ephemeral chat okay to save resources which in turn makes it more feasible to self-host on lower-end hardware or is it better to trust a couple big servers who probably have admins?
There are several browsers that can operate with low memory requirements, but you have to be willing to live without JavScript & the front-end needs to have been built with accessibility & progressive enhancement in mind. …Which most front-end developers don’t do & the industry doesn’t normally pay them enough to care or get better results (& following YouTube tutorials always tells you to use the latest bloated framework which is overkill for your project).
Also Fedora doesn’t ship with LTS kernels which makes me question their package management strategy.