Fortunately, real network admins are smarter than that.
Yes, there are less scorched-earth ways of looking at this, but this works for me.
As always, any of this stuff is heavily context specific. Like you said: network admins need to be smart, need to adapt, need to know their own contexts.
Sure, I'm usually on hotspot, but I personally appreciate when businesses have wifi. Either way, there are always going to be shared networks somewhere.
IP based bans have long been obsolete.