I have some lifepo4 batteries that I was going to set up for RC airplanes. Like a lot of my projects, it never got finished. Walmart discounted some battery packs for tools that used that chemistry so I got them cheap. My RC charger will charge them, so it was popular enough for charger manufacturers to notice. There was a U.S. company that was promoting it heavily, they even had a drag racing team. Lipo discharge rates got a lot better since then and I suspect Liion did too. Discharge rate is pretty important for an RC plane, and the higher the discharge rate the faster you can safely charge them.
I think the issues with Liion packs probably follow LiFePo4 as well. If it's not from a trusted supplier, it's going to vent with flame under similar conditions. It wouldn't surprise me if some LiFePo4 packs have cheap Liion cells in them, it's the nature of the industry that the low-end is often fraudulent.