Well Diablo3 is quite old, the effort to reverse engineer Diablo3 to fix Microsofts or Fireflights (company that did fmod) mistakes which are also present everywhere not just in d3 is quite costly, there’s not such a thing like “lifetime support” for games. Most games end up not being functional on far newer OS builds, thats quite common and the usual route. Often you cant even install them anymore without emulators or ports/refreshes.
With League of Legends riot is shuffling alot of Money its a completely different thing.
Diablo3 doesnt have that financial backup with microtransactions that LoL has.
And in this case your Hardware doesnt matter, its not a compatibility issue or hardware issue at all. Its just the Windows build you use which makes your game not working good with the engine thats being used.
Paying alot of money for hardware doesnt fix every issue, and no you cant play any game without issues without fiddling yourself, you may play any modern game without issues but thats about it. There are games out there that cant even run on win10 at all.
Solutions are in this thread, if you dont want to make use of them, you are free to do what you want. You can also have the opinion that it sucks and that the world should be a better place nothing wrong with that. Only thing i did was explaining why its happening, and why it probably wont ever get fixed and why there wont be any reliable workaround for this other than installing a way older windows build or heavily mod how your directories of c++ redistributionals are being used.
The only reason the “fmod workaround” works for some is because it usually hinders the game to use its sound engine. There is no “update your fmod.dll blizzard” that wont work at all, newer versions are also affected by this or even much worse.