It’s more specific than that. If you want to pick random civ, that’s your choice. If I want to pick a civ and you force me to go random, you are depriving me of my choice.
I agree that meta is getting stale. I hate the knight-crossbow meta in team games, especially open maps. But random civ does not solve that issue. You still HAVE to go knights-crossbow, at least in castle age. By imperial age, I like to go camels over knights, if possible.
Knights crossbow meta exists because that combination beats everything else. What other unit combination counters a knight-crossbow combo? There is none. Well, there is one, which are elephants (battle eles and ele archers). But those are expensive to get going, especially in early castle age.
But, coming back to the main point, that does not mean you have a right to ignore my choices. If you do, I refuse to play. Simple as that