Ok, so I didn't read every word, but here's my 2 cents:
Firefox works great, why are we telling people to use Chrome?
The tutorial does not talk about using the relay app and NFC bump to enroll devices. This is a very efficient way of enrolling devices, as it saves the admin from having to punch in all of the information repeatedly. I don't see how you can have a tutorial of this depth without including instructions for using that method (Work-Managed mode).
Both Firefox and Chrome are great. Not IE for sure.