To make the notifications timely you'd need to request the feed very often, which is super inefficient - 99% of requests would produce no new notification.
I know this, and that is why i do not (my usual pull rate is once in 6-12 hours).
Making a RSS feed is not difficult especially as we already produce them for other content.
thank you. to me rss is one of the best things possible. instead of me manually checking each website, i just get the content i ask for, in cliennt i prefer, from where i can open it however i feel (for example, with threadiverse communities, i diectly subscribe to community's rss from their base instance, which also kinda distributes the load).
i am playing luanti (formerly minetest) and its speed is too slow for me. i have now granted my user fly permissions, and increased speed for it a lot, and just use that (even on ground) if i have to move more than like 5 secs and not climbing or stuff