I would not put Valve and Relic at the same level of awareness of what's good or not for their playerbase. Its a bit offending for valve or at least the team inside valve managing dota2 and all the work they are doing to make their game enjoyable.
At least Valve tries on regular base to overcome those situations and patch their game asap when there is something wrong or not meeting their quality requirements, unlike Relic.
Now I join you on the segmentation issue. coh2 has a primary segmentation dota2 hasn't. Factions. And from what I see many teams and random are more likely interested in playing Axis than allied. And since it took Relic around 6 months bring a first change into the 1st root cause of this situation, balance issues more evident in large tramway, we're not going to see any improvement anytime soon.
But... but... the leaderboard... new faction... UGC...