"I actually can't find much difference between KDE and my Sway setup to be honest"

Can windows be arranged as tabs, i3/sway style? This is my favourite layout at the moment. I disabled tabs in my browsers, since they are redundant if my window manager provides the tabs.

I meant performance wise. Of course using day to day usage is really different between the two, but for things like opening applications and etc. I can't find much difference between Sway and KDE except for the animations.