Nowadays there are (less than $20) single board computers able to “run Linux” and decode 1080p videos like its nothing, so a perfect, plausible answer for your thread is simply “Why not a PC with Linux and another PC for Windows?”. Even if GNU/Linux is decent enough for gaming/working needs nowadays.
Then again, you might be arguing like distros have specific use cases – which is a straight up fallacy. Every distro is GNU/Linux at heart. Theres no such thing as “more useful” since you can simply remove packages/commands you don’t find pleasing/“useful” and add/compile another ones yourself.