It's much easier and simpler to achieve a "perfect vape" using a high wattage regulated mod. You can fiddle with the power level on the fly. To change your vape with a mech, you have to make a new coil. A serious hobbiest doesn't mind that, but the typical vaper just wants to vape and not be bothered making a new coil.
At one time I used to rebuild for RBA's exclusively; that's where using a mech really shines. I don't do that anymore. I've become lazy and prefer the convenience of a clearomizer with drop-in
coils. I just want to vape and not be bothered with the whole idea of rebuilding. I'm not alone with this idea; Zen from House of Hybrids was a master coil builder and he is using a clearomizer exclusively now for the same reasons as me.
I used to use both a mech and a regulated mod. For the past year, I've retired my mechs and using a regulated mod exclusively. I like being able to change my vape on the fly; I like 30 watts early in the day and 40 watts later in the day; couldn't really do that with a mech. I like being able to see my coil's current resistance and the battery level whenever I press the fire button; can't do that with a mech. And there's always that issue about safety; I had a battery explode in a mech years ago and the issue of safety is always in the back of my mind. I feel much safer using a regulated.