But you are making false equivalence, the Win32 GUI API is decades out of date from modern UIs. I can use flutter and make a pixel perfect equivalent of the above UI in an hour, with the exact same responsiveness behavior on both windows tablets and desktop, and scales perfectly in high DPI displays. 3 hours if you want the toggle animation timing to be exactly the same.

I came from the WinForms world so don't pretend I don't understand Win32 programming. The fault lies with Microsoft for not investing in it more.