This is wrong. See posts here from ptitdrogo: https://www.reddit.com/r/starcraft/comments/d4n3tw/alphastar...

> People oversaturated in wol and hots because you didn't expand a lot in these games and bases have a lot less minerals in LOTV, not because of some kind of lost knowledge like some comments seem to think here.

[...]

> Meanwhile alphastar was going 2 gate robo staying on one base making a fuck ton of probes to take a super late natural, it was bad, and anybody calling it the future really bothered me.

Alphastar has not introduced anything new. Its play is strategically poor.