I'm not a fan of Liquid Glass at all, but I just tried KDE again and it's certainly not there yet. Breeze has a ton of weird design decisions, rounded corners in things like list selections that don't work, and even basic understanding for padding and fonts still seems lacking in KDE.

It feels exactly like the KDE website itself: https://kde.org/

That being said, KDE is very usable. I just wouldn't claim that it looks more professional than MacOS. I'd love for that to be the case but it just isn't.