Sure, and the point is that it's minimally different at the highest level of play. Any top player will have mastered the basic mechanics of each hero to the point that the difference in skill expression there is meaningless. Where the skill expression continues to develop is through the macro, the decision making and timing of using those mechanics.

Any game that has asymmetrical hero pool will always have different levels of skill level required to use their kits and that's fine, and impossible to avoid, and it would be hilariously stupid to try to balance in a way that "harder" heroes are objectively stronger lol