I don't think I fully understand everything which the term 'skill ceiling' encompasses. If it's micro management skills well I do agree there is a point where you do hit the 'ceiling'. In my experience for Company of Heroes it does not take long to reach a point where you hold the skills required to play well. Tasks such as performing grenade dodges, solid flanks, correct unit positioning, good arty placement, use of cover and reversing vechiles approriately are performed by all, whether it be a low or high level of play. You can acquire these skills relatively easily, however consistantly performing with these skills throughout a game, especially in an intense high level game is where the difference lies.
Skill in Company of Heroes is not hard to acquire, consistancy is.
If skill also encompasses decision making well there is no ceiling cap. You are always learning. I feel I am maybe in the top 300 players for CoH and have pretty much hit the ceiling in terms of micro. In terms of decision making though there is always room for improvement. After every game I play, win or loss, I generally reflect on the decisions I made in the game and see what is good or bad. Decision making can never have a skill ceiling I feel.
Deciding which engagements are good and tech choices always have a best choice, luck and randomness can sometimes overthrow this, although not by much. Company of Heroes though has so many soft counters I feel it is easier to compensate for a error in comparison to other RTS games which can be much more punishing due to harder counter systems.
Basically it means not enough skills (or refinement of skills)are there to put a gap between the increasingly better levels of players. You're level 16 in auto but if you make some small mistake(s) you can still lose to someone that is level 13-14, because level 16s aren't that much better than level 13s-14s tbh. Yeah we might have slightly better knowledge of the meta game and be a little more consistent, but a level 13-14 can still compete with 90% of the players in automatch if they aren't making lots of errors.
If someone in SC2 gold/platinum league played against a master, they'll get anally raped more often than not because there is a steeper meta learning curve, more advanced tactics to master, more speed required, etc.
But I prefer CoH the way it is, we all think we want this to be an esport because some people think they can compete, but the truth is you are not going to be any match for someone that has no other career/schooling and dedicates 6 hours of the day every day to practicing a game that can provide them with a sustainable income. Do I want CoH to be really popular? Yeah. Can it be an esport? Maybe. Can anyone on this site compete at that level of play with their current lifestyle. Nope.