I think people should have to pick x2 of the categories. Etc pick grapling and stricking, ban kicking. Thus you can still specialize in couple of mods. I dont think you should be able to play ALL the competitive mods. It is true that overall the best player probably can play all competitive mods pretty well. But people should still be a able to specialize in a couple of them. I'd rather also see people who specialize in stricking and grapling mods than people who play all mods decently. Variety is the salt of competition. That way people can specialize but still have to be varied in their mods. Every mod has its unique style and I think best of 5 in 6-7 possible mods is enough. 10 mods to learn properly seems a bit too much for me.

For example in LoL, all the best players can play each role to a certain extent. But to make the best ADC play as Jungle sometimes just because "everyone should be able to play each role" feels a bit dumb. Having to play every single competitive mod possible favors the the players who are "average" in every mod, because even if player x is the best in the game at 3 mods, the 7 others will make him lose. I kinda don't like that.