RSS exists but those authors who don't publish through it probably wouldn't care about it either. Like, if by magic, RSS became popular as a technology, they would publish through it, but then there would be demand for discoverability and algo feeds would win the engagement race and then RSS is in the background and th platform would naturally decide to just focus on the algo and drop RSS and the regular users wouldn't care and authors would only care what regular users care about. Except for the tiny techie bubble.
It's not a technical problem. Less effort will always be more popular and drown out more effort in the mainstream.
Imagine if you could order completely free McDonald's food to your doorstep anytime and could also choose to cook your meals at home. Guess what portion of people would choose which option.
You don't need "that technology to become popular" to make it even more popular. It already was popular enough and it already worked.
Your whole comment makes no sense to me. Completely confusing.
Who are you arguing with? Why RSS has to compete with anything? Why do you even refer to it as "technology" - it's a text file people used to edit by hand in notepad. And maybe automate that with a script in their html editor.
It was popular, it's a fact. It was and is included in multiple blogging platforms. It was used by techies. It was used by non-techies. Learning curve was non existent and it was trivial to use on both ends.
What created friction was: killing the biggest RSS reader service that was free for all and killing very good support in browsers.
It used to be trivial - every browser was showing an orange button if site had rss. You could click it. You could add the feed to browser bookmark bar. It would display feed as nice bookmarks, downloading it live. This is what we lost - and we lost it because big companies wanted us to be entrenched in their socials. The rest was literally trivial.