IDK, OP.
I'm real sorry for your frustrations; I think we've all been there with some set of e-cig "junk" at one point or another. And sometimes it's just...picky stuff...like center pins.
I use $18.00 VV DIY-Build box mods from MV. Simple regulator that costs me a couple of bucks to replace if it fails. But I'm not picky and I like electronics.
I understand your point. Simple is kinda...Zen. But, other times you want flexibility or voltage consistency. So I'm with one of the other posters above...have both. I have all mech mods as spares. Mech mods don't regulate the voltage so it bugs me. But to each their own. The all-mech stuff is famous for button failures too, since the button takes all the voltage through it.
The kick solution makes a meck mod a regulated electronic mod...but I just use a regulated mod to begin with. lol.