Sounds like a legacy software problem. Old Mac software is the same.
Windows relies too much on legacy software. The built in RDP client for example fails when you remote from a high DPI machine to a windows server that doesn’t support high DPI. Microsoft’s own RDP client on Mac upscales perfectly.
Nope. Old Mac software doesn't suffer from scaling issues on high dpi displays.
Windows having DPI scaling problems is a good problem to have since it's mostly rooted in the fact that it supports much older software.