I will say this about HTML+CSS: it's not the best layout system I've ever used, but it's certainly the best one I've used that runs on all the platforms I care about.

That might change with .NET MAUI, though. I'm not too deep into it yet, and it is significantly different enough from HTML+CSS to be a challenge to learn, but what I havelearned so far keeps making me question "why did the CSS version of this have to be so hard?"