I'm not in it for the audience.. in any case, maximalism is mostly a self-assigned title and the author of that blog describes himself as such
edit: how can something that is being discovered be late? The work on PoS is almost completely greenfield and far from trivial. Many people made many far too optimistic comments about how long it would take to get it right but no one can say it's late...
There are testnest live for some time now but there is still plenty to do before anyone should trust their funds into the staking contracts.
edit: I mean, several dPoS networks went live without spending enough time considering the game theory attacks, but now we've seen them used on EOS and more recently on Steem so thats why I (personally) believe a real PoS is still a few months away at best.
ps. Using the word "maximalist" immediately shrinks your audience to other die-hard crypto fans.