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Yeah but I'm thinking make products actually designed to just take straight lithium cells, simpler that way and make it standard. The lithium AA have active circuitry to bring the voltage down so more subject to potential failure. Though I guess the same can be said for protected lithium cells they have active circuitry too, though much simpler.
If more products are designed for it, that would be nice.
For the 2xAA or the 2xDD, often, I try to just see how it works with a single 3.7V LiIon. My emergency radio (2xDD) is now running on an 18650. The 2xAA emergency radio, well, I could use one of those 14500, but reluctant for reasons I already said in prior reply.
If just more products can be made to function down to say 2V, then the 2xAA or 2xAAA can run nicely from NiMH. Or, we should revive Alkaline recharge cells that really put out 1.5V, and rework it to have hundreds instead of tens of cycles, that would help too.