I think this is gonna be the meta for a long time now until riot nerfs astra. The astra-viper meta is too op now and the teams who doesnt do it are gonna lose. Trust me :)
the point of the combination of Astra and Viper is that the game revolves around plants and postplants. Map control doesn't matter here, if you are running such a comp all you need to do is execute on a site and waste the retakers' time with utility.
even viper is really good at locking down a site, astra not so much, but astra can lock down a site well if there is a teammate that can play off her utility