The fact that most people are using cheap protected batteries in mechanical mods instead of quality, safer chemistry batteries doesn't mean we should be promoting that practice.
PS: I'm willing to bet there are a LOT of people using protected batteries in regulated devices, because that's what China is shipping in the kits.
I'm not sure I completely agree with your last statement, but I do agree with your first. Concerning your last statement, there might be those distributors or online vendors putting together so-called 'kits" with the incorrect battery type. At the very least they throw in a cheap, no-name, unlabeled battery which I would personally never use and would throw it away just to be on the safe side.
If I've learned anything since I began vaping, it's to not skimp on battery quality or quality chargers.
I'm not an expert on batteries, but I have done a fair amount of research on them. I personally believe that all things being equal,
any IMR battery will be safer than any protected battery, but that is just my opinion and I don't know that to be a fact. Many manufacturers still recommend the use of "protected" batteries in their APV's. AltSmoke happens to be one who strongly recommends them in their APV's like the Silver Bullet, Omega, and BB.
However, since I had one of their recommended protected batteries vent about a year ago in thermal runaway in my BB, I've since stopped using any battery with the name "fire" in it (Trustfire and Ultra Fire), and using only the red AW IMR batteries in both my mechanicals and electronic APVs. I feel safer using them than any protected battery.
That's not to say that a safe chemistry IMR couldn't vent, too. But because the chemicals used in an IMR is less volatile than those in a protected battery, the likelihood of occurance and amount of damage would be less.
Once you experience a "battery incident" yourself, you learn to respect these tiny powerhouses of bottled up energy and realize that if you don't practice the utmost in battery safety you can suffer a serious burn or cause serious fire damage to your home.
Advanced personal vaporizers are not toys. Not all batteries are created equal. The batteries we use in our APVs were not specifically designed to be used in them, but for other less demanding applications like flashlights. When vapors start pushing their APVs and batteries to their limits for such applications as ULR coils, then they are literally playing with fire IMHO.