Yea, I think the 5 is so that you cant accidently cut the power or in my case go into the menu system.
And I beleive most have fail safe to that will cut itself of if its power too long. I know my Provari does.
Mine works a slightly different on the 5 clicks though. It uses the the 5 clicks to get into the menu. And then a single click in menus to make adjustments or go to the next menu.
Options to to adjust Voltage, Check battery, Check Atomizer Ohm, Turn On/Off etc.
On mine, It has a Power On/Off option but all it does is disable the fire button.
I can still navigate menus and such. I do disable it if Im out and a bout and its going to be in my pocket a while. But for the most part(99% of the time), I just leave it On.
Those small pen do work well and accomplish the goal they are intended for. But it seems most do eventually end up with larger variable mods.
Same with PCs. many will start off with a Pre-Built Dell/HP or whatever and eventually end up building their own later with a OCing MB etc. Both can do the same job, but the DIY high end ones just do it better.
Theres also what they call Mechanical Mods, which have no limiters. You need to know what you are doing with these though because they will happily blow out a coil in a heartbeat.
Most of the variables have a saftey precaution in place. My Provari for example won't fire if my Voltage is set to high for the coil I built. It just tells me its way too much power via a code on the display. Fairly certain a MVP will do this as well.
But the only reason to use a mechanical (IMHO) is if you want to be running sub OHM. any coils under 1.0, such as a 0.5hm. But to do that, you really need to be building your own and have a good Rebuildable. For me I have no desire going mechanical though because mine exceeds my expectations anyway so no need for more.
Thats one of the things I love about vaping. Your setup can be as simple as you want or as complicated as you want. Everything from your setup to your juices (vendor purchased or mixed yourself)