Semantic web webdav/caldav implementation?

hi, i was looking at web3.0 & semantic web stuff, and thought, activitypub is a new standard, in a decade would i imagine webdav/caldav to still be around? i would, like rss or irc, and i'd expect a better standard to come along as well which explicitly includes tasks

does anyone know of any communities i could go to, in order to chat with other folks interested in this? it's something i'd wanna work on in my free time

context

i've been looking for a solution to manage tasks and reminders in a standardized way, to sync across devices. it seems like caldav is used and tasks/reminders are treated as events

i was hoping for something more specific to tasks, like having a sequence of tasks linked to one another or in addition to a vertical hierarchy, horizontal linking between tasks

i realize stuff like a kanban board, e.g. trello would fit my needs and it can sync with caldav and it's like 70% the way there and not exactly what i'd like

tl;dr

new webdav standard w/ cool task features when?