Yeah. What parent would allow a kid vaping anyway?
Back on topic however, the problem with protection circuits are multiple:
1. Higher internal resistance, so lower amp draw is possible, and more capacity is lost.
2. They can fail. If they fail and you put them in a light without LVP (NITECORE!), you are going to discharge them down too low without even knowing it.
3. Sometimes, they are wayyy too expensive. Why would I pay 20$US for a single freaking cell?
4. It justifies manufacturers to only support button-top protected cells, and allows them not to put LVP in a light anyway.
And besides, lithium ion cells in the cylindrical factor, with less volatile chemistries than pouch cells, are much safer than the cells inside of your mobile devices like a smartphone.
IMO, I’d be more concerned with charging a phone right besides me rather than in a dedicated 18650 charger.