Yes, since it's a requirement for many applications. It should be part of the installation process:
allocate IP for a new server and user for AD connection
I don't get this, if the user is setup in the join stage, it will be valid even if the AD sysadmin is on vacation.
I would also assume that in most scenarios the AD sysadmin and NS one, are the same person!
We need to ease the life of users, not arguing about best practices.
@filippo_carletti @nrauso @CharlieWhiting how many times sysadmins face this kind of problem?
If the problem arises 90% of times, probably it worth to restrict configuration freedom and make it work.
Otherwise, if only few people encountered the problem, we can just add a documentation line inside the join form.