> Their main purpose is enabling their users to consume content

Here we go again... no, "consume content" is what the commercial social networks want you to do so you stick around until the next ad break. (Maybe even what a commercial SaaS RSS reader wants you to do so you pay the next bill.)

I use RSS specifically to get away from generic "content". Instead I read to learn things, and to explore opoinions I might not otherwise come in contact with, and to socialise with other people.