> so much internet content was somehow related to quality interaction with other people

That still exists. Except now it's not in IRC or BBSes but in Discord "servers" instead.

Discord servers skew towards a very young demographic. One of the striking things about the early-millennium blog scene was how much quality long-form-text interaction it facilitated among relatively older people: the average age around a lot of blogs on topics like the arts or literature was like 40 or 50.

I think for people that age now, the internet is a much lonelier place.