A lot of people do, there’s no reason to push past 2400 for most people because getting to it is a journey as most of the Shuffle players are first time 1800/2100/2400 due to the inflation but also because there’s no incentive to fight the same meta specs over and over.
I’m not saying Shuffle can’t be fun but in genuinely requires zero skill or thought which is what makes arena great in the first place.
You can get to 1800 by not CC’ing properly or doing basic mechanics because of how inflated it is.
The gameplay shouldn’t reward FoTM chasing/random BG style players.