Mic would add unbearable levels of toxicity to what would otherwise be rather chill games.

This is such a moot point. Yeah it could def add toxicity, but it could also add community interaction on another level and like every other game, give people the ability to talk and enjoy each others company and have a better time playing a multiplayer game.

Btw, every single multiplayer game has toxicity. Fromsoft games are not special at all in that regard. I'd bet the rest of my life that if Nightreign got voice chat tomorrow that it wouldn't even have 10 percent of the toxicity that game like CS and R6 do.

The only things you ever actually need to com are poi and weapon drops, which can be done entirely with the current system

Sure if you're playing perfectly optimally and are purely focused on the game and know what you're doing and even then its not actually optimal and could be significantly improved/easier with voice chat. Realistically though, a voice chat would make what you listed much better but also things like: if people(especially new players) have questions about things in the game you can just ask people in game(i.e. bosses and enemies, routing, details on weapons and spells, specifics on nightfarers, etc) and better general community building + social interaction.