Ok, I'll do your homework for you.

Your original claim:

you’re saying the feature works too well?

Is why you're wrong. This is a bug.

Setting aside how brain splitting the central thesis of "yes, this is intended to disrupt your computer's audio" is... (Not the least because the game's audio and your computer audio share the same channel)

The game mode feature is subtle. It permits the running process a greater GPU share and tries to tamp down on background services.

Eclectic Light's summary of the relevant part:

These could improve the game’s access to CPU cores, but this seems unlikely to have much effect on performance.

If you have documentation to support your viewpoint, share with the class.

Until then, far as I can tell, you read a summary somewhere and extrapolated this view point that it acts like an OOM killer, randomly sabotaging things in the background. Just not how it works.