There is a counter to everything, be it commander selection, standard units or playstyle.
If a player is struggling with con / gren spam then once again that is their problem not the games, regardless of their skill level.
Every unit has a counter but its not that black and white.
A) You don't always have the best doctrine to choose from to counter scenario X because you first have to be lucky enough just to have it in your loadout when you need it.
B) Lack of hard hitting global upgrades= less ways to outsmart opponent. Making the right choice between BARs, WSC, M8, or whatever else was extremely important. So was making the right choice between heavy T2 with vet, fast T3 for Pumas, big T1, and so on.
C) Tech pace makes certain back teching playstyles less viable. If someone goes for the cheesy one dimensional a-move strategy, your time window to expose the weakness in his infantry unit composition is really short because tanks come so much faster.
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Like Kolaris said, the 'competition' are not equally skilled players. If the top 50 players had lower W/L rates because they lose almost exclusively to other top 50 players, great! But thats not the case here. If this new blood rises to the top because they really are that talented, fantastic. But in reality its a combination of the games lacking strategic depth making it easier to master, and the exodus of a lot of really good players (which is cause-effect, but nonetheless makes it even less competitive as the net result). And you are right somewhat that the game does take skill, but the gap between mid and high level players is a lot smaller.
But no matter how many well elaborated points are made by the critical crowd, in the end it doesn't matter because Ciez refuses to believe anything other than he is a great player in a game that is really hard to master. You never even try to debate our reasoning, you only attack us on the basis that we aren't actively playing the game anymore.