OK—the skeevy factor. I don't "hand" feed them (difficult for me to hang on to), but I do occasionally feed them using a forceps tweezers. No biggie.
I agree with this, except that dubias of appropriate feeding size remind
me more of isopods (roly-polies).
Dubias aren't going to breed in your house unless you live in one of the states where they're illegal anyway (which is
why they're illegal in those states). The only ones I've ever had escape weren't big enough to reproduce, and wouldn't survive long enough to. For whatever reason, IME they die within a day or two when outside the colony.
I don't (have to) handle them per se; I either pick them up with the forceps, or tap them into a feeder bowl much the same as a cricket tube, which I find works
very well.
The key word was
variety. It's probably more a question of interpretation whether I use them as a staple or supplemental feeder. I often (usually?) put both in the feeder bowl together, with a higher ratio of dubias (by weight).
BSFL are fine as a staple (again,
variety) and don't require dusting with calcium—they're high in calcium on their own (see nutrition charts). My experiences with them were not good, and eventually, they just weren't worth the trouble
for me. Others swear by 'em and I wouldn't argue.