This behavior is similar to Windows 11. You have to position the mouse just outside the window. It is non-intuitive and awful.
These are problems humanity solved over 35 years ago (see NeXTSTEP). Why are these designers breaking basic features that worked for over 35 years?
This is probably not a coincidence. I can pretty much guarantee you a developer said something to a designer like "hey, most of this is outside the window, is that fine?" and the designer said back "well, I think so, but let's check what Windows did," and then they okayed the decision at least in part because Windows did it.
Engineers (hopefully) come to learn the value of Chesterton's Fence young, because engineering failures tend to make themselves known quickly and loudly.
Designers probably have perverse incentives. Showy new designs get promotions. Even when they hurt usability, it's often only in insidious ways.
IIRC, win8 was the last windows to have thick graphical window borders, and that was after they got rid of the texture/aero look from vista/7, so at that point you at least had something graphical to grab onto which (mostly?) matched where the cursor was. Then in win10 onwards they shrunk the border down to one pixel with the zone around it where you can click off the window but still affect it.
On the back of my mind I think part of this was the move to fit scaling to large resolution monitors (i.e. 4k+) work better, as a graphical border of a fixed pixel width will shrink proportionally compared to a border that is as thin as it can be. For a while I've felt that it's a missed opportunity on high res displays to not use more detailed art for window chrome as pixel wide will only get smaller and more difficult to distinguish, such as the minimize/maximize/close icons which remain pixel wide line art even at big scaling.
History always repeats itself. The young generation always thinks the old generation was rubbish and they have nothing to learn from them and can do better.
Fun fact: NEXTSTEP went 10 years without shipping a basic design refresh, except in prereleases (4.0PR1 and traces in 4.0PR2.) This was because it was a good fucking GUI that did its fucking job, and had "usability before aesthetics" as a core design tenet in its developer documentation.
Steve's brain fell out when he got back his throne at Apple. Aqua was a mistake.
the inability to just hold win+mouse1 to move or win+mouse2 to resize is driving me insane compared to KDE
Call me cynical but I think designers need to occasionally break things that were already solved long ago to justify their continued relevance. Explains a lot of redesigns that make things only worse, reshuffling interfaces, hiding things behind menus in form over function redesigns, etc.