Yes, it seems like UI designers only solve the basic use case: beginner user with 3 apps open on a 14" laptop, each full screen, or tiled side-by-side.

I imagine them presenting their design on a static PowerPoint slide, and upper-management says "beautiful", and they move on to CoPilot features, never looking back.

The Teams... team... took several years to let us pop out chats to their own windows. The minimum size of the window was almost half my screen for a long time, which was annoying since it had a mobile app and my phone is way smaller.

Someone would send you a document and it took over the entire Teams window. You had to exit it in order to chat with the person about the document. The concept of having more than one 'thing' on screen at the time was completely missing. My only explanation was that the developers had never used a computer before.