Ah, you got me. Cellphones - drat!Neither are celular phones Pete, but that don't stop the market from buying them.
I see a market for key fob sized lights slowly becoming more and more popular as they figure out how to focus beams to make 20 lumens look like 200. Klarus Mi2 for example.
I'm starting to think if I give people a light and they have a smart phone and are used to it a USB rechargeable one may be a better option than one with replaceable cells that have to be removed and placed in a charger that has to be purchased and the person trained proper charging techniques and troubleshooting and care of batteries including proper storage of lithium cells. This may be a better option that giving them a light that they may be encouraged by ignorance or laziness to use alkaleaks in.You’re winning me over, keep going.
I find USB recharging unneeded for cells/lights as I have a single cell charger that itself can operate on either USB or 12vdc input and operate also as a power bank with an 18650 in it so it is doubly useful. I find that it can charge a cell considerably faster than USB cells and built in chargers plus you can monitor things like capacity and voltage while charging to be sure your cell is healthy or not. USB based chargers in cells and lights mostly micro USB are probably limited to 1A and possibly only 0.5A rates while my charger can do 2A and charge at 300ma for smaller cells even plus charge other sizes and nimh cells in addition.We (flashaholics) are the minority, so the average person needs to have something easy to use. Built-in USB charging is easy and convenient.
I always take USB chargeable lights/cells when travelling, camping or going on holiday (that thing we did before COVID), so find them very useful.
In absolute terms, and for a light I would need to be robust and waterproof, I would choose one without USB and use primary cells in it.
I will say it certainly makes gifting some of my older lights easy when they are USB chargeable.