The risk is inherent in the fact that TWRP has root access.
The "fat finger" or human error risk is quite real, a inadvertant flick of the wrong button and you can fry your phone.
I did do the Max1 Prime also.
Scrubber does not start up, but *no-support-for-this-app-on-this-forum* seems to work well.
Have not done anything with it after trying it out.
Does any Mi Max 2'er here using MIUI 10 ? how about *no-support-for-this-app-on-this-forum*, does it works with MIUI 10 on our Mi Max 2?
Don't have Max2, but it's working on eu weekly 8.7.19 on Mi Max1 Prime (helium), that's MIUI 10 Android 7.0.
Also works on Mi Mix1 and Mi Note 2 on eu weekly 8.7.12, MIUI 10 Android 8.0.
Now I haven't bothered to update the *no-support-for-this-app-on-this-forum* versions to get everything working, such as portrait mode, etc.