The shield and orb, yeah, i agree. Lame to bring them back. I always wondered why there was a training remote on the falcon in the first place. Nothing implied ben brought it in his carry on bag or anything, though that would make sense.
The training as kids, sorry, but that works just fine. Luke was too old at 17-18, ergo, the age had to be a good deal lower. If your going to train people in a monastic style so to speak, grabbing them as kids works out best quite frankly.
The carbonizing i agree with you. If they wanted to get the point across in ESB that that specific one wasn't meant for humans, they'd have done that. the line was you can't put him in there it might kill him. It was not this system isn't one meant for humans (beings, or whatever), it might kill him.