You’re looking at this the wrong way
It’s to let cash-strapped people run software that won’t run well or at all under WINE/Proton and use devices that are not natively supported in Linux.
Yes, One can use Wine, PlayOnLinux, Lutris, etc. to run Epic Games launcher, but the overhead makes games perform worse than running under Windows 10. Also, Blizzard is an a*****e that tempbans users who try to play their games in WINE/Proton.