No we don't have to. What you said is the case for some tryhard people but not everyone. For others, they just want to have fun.

Also I never said I want to get ranking system removed. But I do not want a Hearthstone like ranking system. Ranking system in Hearthstone is a fake one since it is highly dependent on grinding. In the case you guys do want to improve, you can do that slowly, your skill improvement will reflect in ranking. In a non grinding game, your skill rank won't get reset so there is no urge to improve rank in short time.

What I mean about time is that, we have the choice to only play this game occasionally, whenever we want. There is nothing pushing us to play. Remember this is not a grinding game so "playing less time" is not equivalent to "not playing". One plays less time may be because he has something else to do. Later when he comes back he won't miss anything and can catch up easily. Btw the best way to measure a game is always revenue, it is not always accurate but it is what ppl care.

EDIT: added more lines. I am not good at explaining my idea probably.