I told a big story and forgot to elaborate on the exact point you had asked, so here it is:
if these new inventions have such obvious flaws that make them impossible to scale to a billion users, why haven't their own inventors realize it?
For a long time I thought they were just not seeing the issues, but after some experiences I observed I changed my answer.
Now I think they are not really thinking about changing anything, they just want to see their pet project running, and they are happy if it runs with a few thousand users and they're idolized by some of them. I don't really understand it and can't imagine the feeling myself, because to me the technology or protocol or whatever is really just the means to what I consider a higher end, but to these people I think the technology itself is the end. This perspective is what I was calling "unserious".