Most people don’t play 1’s or care about tournaments. In regards to multiplayer. Replays and observer mode sure.
I'd say its a bit more complicated.
Most people might not be playing 1v1s, but its always good to see best ones play against one another, tournaments of COH2 were popular for views, even if most viewers prefer team games themselves.
And yes, replays is not only a qol feature, its also something very important for content creators to have and you would think it would be very important for relic as well, given how these casts can create free advertising for the game.
Scarcity of maps across game modes really does make it feel like there is less content in the game despite having twice as many factions at release with much better fleshed out mechanics and depth too, we didn't feel it as much in CoH2, because maps were shared between game modes, something not present here.