Lipo and Li-ion are essentially the same thing, particularly from a safety point of view.
Nominal voltage per cell is identical, 3.7v. There's just more cells in the average RC battery. A mobile phone battery is no more or less safe than an RC battery, the main difference is that RC batteries tend to sustain more abuse.
There's no reason NOT to want to use one, I'm merely saying that the NEED to use one is massively over stated. Peace of mind? Sure. An essential part of owning and using a Lipo battery? Nope.
Not a valid comparison. Statistically, you are thousands of times more likely to have an accident in a car than have a well looked after Lipo vent on you. When you wear a seatbelt you are mitigating a very real danger that you face on every journey, you are mitigating dangers that are out of your hands. How dangeruous a Lipo can be is 99% down to how it has been used and looked after. If you know that you look after your Lipos and don't abuse them, charge them correctly, and don't ignore any puffing, then you've already massively mitigated the danger.
I'm not saying DON'T use Lipo bags, ammo tins etc, I'm simply saying that the NEED to do so is overstated.