Especially if they're made in an engine that has been previously optimised, for example.

Like, right now, my Nvidia Geforce Experience app is telling me to update to the "Game ready driver" for Diablo 4.

What is Diablo 4 doing so uniquely that it can't make full use of the general purpose firmware that is already there? Surely, it wouldn't have been designed in a way that would run poorly unless Nvidia made a new version that set straight their performance blunders, right? What are they doing here?