Maybe there are some very specific situations, where its ok to call a jam from a maniac with A high on the flop. But I am thinking more about situations like having AJ and getting 3-bet by a maniac with a 50BB stack. Then we should usually just jam it in and not be scared of taking on a high variance spot against a maniac. There are literally no bad outcomes from this:
1) They fold. Then we win the pot, plus they might cut back their 3-betting a bit against us in future hands
2) They call and lose. Then its job done, and we got their money, before someone else did
3) They call and win. This is obviously not great, but at least now they have a 100BB stack, which allow us to win more money from them in future hands
I think, just calling that 3-bet from the maniac with a hand like AJ is a huge mistakes, especially if we are then going to fold on the flop, every single time we miss. And folding to the 3-bet is of course also a mistake, but probably better than calling, especially if we are out of position. The point here is, we dont need to sit and wait for a premium hand like QQ+ or AK to play a big pot with a maniac. Second tier hands like AJ are often good enough, because they are still ahead of the maniacs range.