In my spare time I work on some networked applications, and so have had to look into security and all that. The one thing they tell you is to NEVER FUCKING TRUST ANYTHING AT THE OTHER END OF A NETWORK CONNECTION. No, anticheat rootkits doesn’t allow you to ignore this, and it’s massively irresponsible to rely on anticheat as your main way of ensuring security.
If someone gets past rootkit anticheat on a “normal” game where it is being used as a replacement for proper server side anticheat, it’s no big deal. Just have a reporting system in place, and ban them. The worst you’ll get is people on Reddit complaining about “rampant cheating” or whatever.
If someone gets past rootkit anticheat on a game where it is used as a replacement for network security fundamentals, you’re suddenly going to have to find a way to explain to all your customers (and possibly lawyers) that due to your negligence, other people have had full access to their computers.