This makes no sense to me what so ever. Why do any apps care about where the taskbar is? How’s it any different when a window isn’t maximised and the user resizes it? Either I’m seriously misunderstanding this or it’s a completely made up excuse.

I’d rather they just say “we completely rewrote the taskbar, but we know that less than 0.01% of users move their taskbar so we didn’t prioritize it”.