I read all blog contents that i follow from my RSS reader so i believe it is important for content providers to publish RSS feeds. RSS is still a nice standart for publishing.

I even forgot what it is, so - No, not relevant anymore.

I have configured Facebook/Twitter news feeds and always receive information and notifications I need in a modern way. There are also many other tools and news aggregators available today.

Even if it is a small personal blog, author should share new articles on Twitter/Facebook or even write/publish on Medium and other portals.

If you want to make your information available in modern world with over 9000 qwertyB of data, you have to use modern marketing and publishing tools.

hmm there is still IRC and newsgroups so it will remain to exist I guess, regarding relevance ... google discontinued their RSS aggregator and I think that was actually the killing blow. If I remember correctly.