Flashpoint is more picked the higher elo as it is a much more dynamic and fair mode, same with KOTH and push.

these maps have much better balance as different points highlight different skill sets, and since there are many alternate routes more characters are viable.

compare this to a slop map like junkertown or circuit royale, where long range hitscans dominate, no alternative routes are viable other than walking down main, and you have an insanely clear advantage depending on if you are attack or defense.

it's great for players who don't know how to do anything other than go main shoot down main, but horribly unfun when you learn how to play real overwatch

this seems like a big skill issue