This hack works. I wish there was way to disable internet for some apps. I am sure that's possible on android.
So at least Huawei did something good with their own UI.
Even if it was a passive permission - i.e. you had to specifically go into settings and disable it, rather than being asked for each app - I'd be fine with that.
It's open source.
Joking aside, iOS has supported VPN connections since as long ago as iPhone OS (feels weird calling it that now) 4 I think?
My Motorola Moto G4 Play has Android 6.0.1 too and the only option present is to restrict background data.
Can't say I'm too surprised by this development. I am surprised they were magnanimous enough to give it in the first place.
enjoy