Does sound like there might be a case for not allowing a laptop in the aircraft. Maybe I'll add that to my passenger briefing list.
My rule would be to not allow in-flight charging. The causes of battery ignition appear to be either a puncture or overcharging.
Airlines normally allow in flight use of laptops, and they allow them to be connected to the power points provided in business class etc. I would guess they have done some studies on the risk.
I've never seen a consumer item battery go off but Sony got a name for it some years ago, with a duff batch of batteries.
Personally I don't use a laptop in the air (no use for one) but do fly with a tablet computer which has a lithium battery. Apparently, it is not a LIPO type.