Not excusing Vanguard, but if you’re running Windows then your entire kernel is a blob. If you’re running most linux distros, then your kernel contains blobs for drivers.
There really isn’t a complicated discussion to be had unless you needlessly complicate things. There’s a big difference between having, say, better monitor or headphones in terms of resolution or sound quality vs having a monitor or headphones that add extra features.
It’s like saying that AR glasses that visualize a ball’s trajectory should be allowed in tennis or football because players can already invest in better rackets or shoes.
The detection problem is not unsolvable. First, you can forbid people that are using that monitor from matchmaking. You can find your monitor’s model number using software so that would be trivial. For a more nuanced approach, you can examine players’ reaction times and ban people that got too good too fast.
Not excusing Vanguard, but if you’re running Windows then your entire kernel is a blob. If you’re running most linux distros, then your kernel contains blobs for drivers.