Is the relative inferior support of NVIDIA/Intel dual graphics on Linux compared to Windows more of a technical issue or licensing issue?

I have been using Linux desktop since 2014 and now (2020) it seems that the official support of NVIDIA/Intel dual graphics on Linux is still relative weak compared to Windows (please correct me if I am wrong). On Ubuntu there is a prime-select package that switches the graphics card (which still requires restart the session), but on some other distros this package does not even exist. Prime-synchronization also needs manual setup and sometimes breaks the GUI system. Is there a real fundamental technical problem that prevents seamless graphics switching on Linux desktop, or is it just a licensing issue that prevents some techniques from being deployed, and prevents both sides from being happy and making money?