To those instructors who are spouting such dumb platitudes to their students I would argue:
As an instructor you are not just diving alone, you're diving worse than alone. You're diving with as many as 8 people who are actively trying to kill themselves AND you. No student is checking your gear, nor are they going to bail you out of trouble; they assume whatever you're doing must be right... even if you're dead wrong.
That said, I have known a great many instructors I'd never trust to their own devices as solo divers.
As an instructor you are not just diving alone, you're diving worse than alone. You're diving with as many as 8 people who are actively trying to kill themselves AND you. No student is checking your gear, nor are they going to bail you out of trouble; they assume whatever you're doing must be right... even if you're dead wrong.
That said, I have known a great many instructors I'd never trust to their own devices as solo divers.