Rooting phones is easy.
It takes less than an hour.
If you can follow directions you can root a phone.
Samsung Knox is something they put on our phones because they don't want us using our own phones to their fullest capabilities.
They want us to basically RENT our phones from them instead of OWNING our own goddam phones that we paid for.
Same reason they used to make it such a headache to unlock phones to move between carriers.
Normal companies try to provide good service to keep their customers. Telecom companies use bully tactics to try to keep their customers. They are unfamiliar with competing in a normal market.