Legally this should result in a lawsuit because when the warning occurs, the volume is KEPT at the high volume and the volume control itself is DISABLED by the idiot at Microsoft who did this. The volume remains high until the user clicks away the warning AND reduces the volume. That is so much easier than adjusting the volume.
The fact is Microsoft has no idea what the actual volume you are hearing is because they are not the only program running. I am sure Microsoft's Excuse Department (best staffed department in the company) can provide a number of reasons their software has to suck. But there is reason for concern. High volume obviously caused brain damage to the engineer who wrote the code, the lawyer who told them to put it in, and the idiots who "tested" this. It does not prevent anything except satisfaction with Microsoft.