I definitly agree on that, as you said, it will bring furthermore challenger in the competitive matches, as for example, right now, you can climb on the leaderboards just by playing whatever you're good at, as if this gets added, you will have no choice, but deffend your rank in the leaderboard by playing maps that are different from what we're used to play. Taking myself for example, I'm used to play in stryde-sniper, I'm a big fan of it, as if I manage to climb up on the leaderboard, I'd need even more skills to do so.
Having a look from the other side, this would insipire the map makers to do even more maps... Once again, this would bring activity in the game.
This idea would bring more challenging ranked matchups, that would result in more interest towards the ranked matchups and towards the game, so +1 from me.