Charging I can not see any problem with, just a thing one must do with batteries. Even to charge at the field with 12 volt (marine or similar)battery is no problem (I do it often with 80 Ah Pb battery).
It takes too long! You have to buy extra packs if you want to fly right away. Eventually you will overcharge, either from your error, or charger malfunction.
If You store LiPo with about 60% capacity they have rather good shelf life, at least the one I use (from Hyperion, ThunderPower and DesirePower).
I tend to get out and back intoof the hobby for various reasons. Been out more or less for about 5 years and most of my battery packs are no good. But all of my engines and most of the fuel tanks are good. Batterys won't sit for more than a few years before going bad and engines will last indefinately.
Burned batteries is not that common I think but any LiPo batteries should be handeled with care. And always leave about 20% capacity in battery when running, never run it empty since that is a rather certain way to ruin LiPo batteries to soon.
Maybe not but I burned the first electric plane I bought. And I damaged a Sig Kadet with burned reciever batteries many years ago. I don't hate electric, but I hate batteries with a passion. Maybe if they come up with model fuel cells I would go electric.