I admit to getting to DM with a minimum of dive requirements, though I did not pad my numbers at all.
I was never encouraged to pad numbers at all.
But I also have a shop supporting me where DM is seen as a starting point for instructor development. I have very active, concerned and professional mentors who take it as part of their responsibility to make me a better DM. I am under no illusion that I know all I need to know. And I plan on staying a DM for a fairly long time before going forward.
My reason for getting to my DM was specifically for the mentoring relationships that it opened up for me. Which will not only make me a better instructor when I do get there, but also is making me a better diver much faster than any other option I had available to me.
DM to me is pretty much equivilant of "student teacher." Sure, you have all the book learning, but you don't know anything about being a diving professional (no matter how much diving experience you have, as a professional, you're not diving for yourself, but for others, and in that respect it will always be different). I fully expect that I'll spend far, far more time as a DM than in getting to DM status before I'll think of myself as ready to teach.
I also agree with having a miriad of experiences. From an education point of view, I'm nearly to the point of having completed all of the specialties my agency offers, even if they are not required for my DM status. I also make sure to try everything from open ocean diving to ice diving to muck diving whenever the oportunity presents itself.
Experience isn't the issue. Attitude is. I wish that instructors, or at least CD's, had more leeway to disqualify DM candidates (and even DMs) based on attitude. A DM who thinks they know anything is, in my mind, a danger to themselves and the instructors they are assisting, not to mention the students in the class. We are their to help and learn. The expectation is that we know enough to provide a safety margin for students, and to perform simple tasks in class management for the instructors, but the idea that we "know it all," is not only counter-productive to the class-room environment, it is also completely unrealistic.
One of my shop's CD's, a guy with almost 50 years of dive experience, has noted that if he ever gets to the point where he thinks he knows it all, then it's time for him to stop teaching.