The tank and 6v6/5v5 has been heavily discussed, recently devs made a long devblog about it. I can kinda see where you're coming from, I think, but between balance/queue times/the average player (of which there tends to be more of when you're with 5 others instead of just 4) it seems to me like 1 tank works better in practice even though it struggles when compared to the ideal world+nostalgia goggles.
I was very pleasently ~~surprised~~ not disappointed by the monetization, like uncompleted weekly (battle pass -primary method of profression) challenges carry over, so in theory you can do all weekliesduring the last week if a battle pass. also aren't the new heroes available if you play just a few matches?
that is one way to do it, and it's a very common one - it's robust and simple. So I can't correct you, but thought I would add to it. In NixOS, they've improved it by making sure all your apps are symlinked, and when updating, these symlinks are updated. That way you can start using your newly updated system straight away, without a reboot. When rebooting, you are prompted to which generation you want to boot into, (defaulting to "latest" after a few seconds of no input) making rollbacks a breeze.