It's not about being smarter than others IMO, it's about having a contingency. I can get AA cells anywhere and can't always find a plug and several hours to recharge if I decide to branch out and not return home when originally planned. It like water. You can't always carry enough to complete a trip, the load is too great. Sometimes you have to find it along the way.
If you could plan everything you would ever need a backup body. You woul plan for your primary one not to fail.
Okay...how many times has the AA tray saved your ass? You seem to be missing the point. I get it. I understand the THEORETICAL advantages. All I'm saying...is that the stories of "Wow, that AA tray really saved my butt today" vs. "Yeah...never used it...in fact, couldn't tell you where the hell I put that damn thing" are roughly 1 for every 5,000 and thus, in my opinion, not really a deciding factor in whether one should or shouldn't get a grip.






