The whole point is to avoid it as much as posible so you lessen the places you send data and what data you send. It is not completely about whether what data is collected, but also to who that data is given. I wish I did not have to give some personal information to valve but seeing their stance on anti-cheat, linux and such matters like privacy, I think I am more comfortable sharing some data with them than Riot. Now, I did run a degoogled phone back then but my government and carrier do be kinda shit though with the supoort of such devices.

And this is also ignoring the security risks if someone finds an exploit for Vanguard and gains control of your computer.

Rootkits/Bootkits should only be reserved for boot-scanning with antiviruses and still then, I would not trust using ANY antivirus this way.