A couple? Quite a few people have dozens of them.
At least a couple. Not everyone can afford dozens, even the less expensive ones.
@Baditude you're absolute right, of course. In light of deeming regs if I could only pick one, I would go mechanical for the longevity. Still, for those that can afford more than one device, there's really no reason a regulated mod-- especially one without an internal battery that can die and leave it basically useless -- can't last a good long while with proper care. I mean, I'm more of a regulated person myself so I've had more than my fair share of failures. There's really no argument to be made that (most) mechs won't outlast (most) regulated devices which have way more parts to fail.
BUT. I take good care of my devices and have lots of older regulated mods that still work just dandy, even the ones that were never the best devices.
I don't have a ton of money to devote to ecigs, but because I've managed to hang on to so many of my past devices, I can rotate through them quite a bit. I am sure this is no small part of making my regulated devices last as long as they have. I'm only pointing this out to say that for the few among us who really have absolutely no interest in a mech, it's possible to make your regulated devices last a while. It's much easier if you have enough of them to rotate regularly.
Anyway, I'm really not arguing any of your points. I completely concur. I just still worry with new vapers and mechs, at least those who want to push the limits. If I could make sure that every new vaper with a mech and an RBA stayed at or above one ohm builds to start, I would. At least until they were not comfortable. Of course I can't ensure that and for a lot of people, the temptation is high. Because of this, for at least the next little while I have a hard time recommending ONLY a mech to a new user who can afford to have both. Plus, many particularly nice mechs are very expensive, though I know it's not impossible to find a quite good one for a decent price, especially if you are open to clones.
I just always err on the side of caution. I usually won't even put an RDA on my mech until I've got it working nicely on a regulated device.
But again, if I could truly only pick one with the deeming regs, no question it would be a [parallel] mech for me.