You went into a tangent and talk about multiple subjects. All good subjects nonetheless. I know a few poker bro who considered themselves short stack specialists. At first I disagree with that logic, because if you're good then you want to buy in deeper vs weaker opponents, but the more i play live poker, i found out that this strategy is not bad at all.
A short stack specialist is meant vs chip stack bullies, because when he is in a hand, he is setting himself up for an ALL IN to double up his stack. Being short stack, his edge is that alot of decisions that would have been difficult now is simple, and he is impossible to be bluffed off a hand, whether if he is was deep, he might have folded a winner to a good double or triple barrel bluff.
Another edge for a short stack specialist is that, on the opposite end, when he is all in, a weaker player might be committed to call anyways because the pot is too good, whether it should have been a clear fold, now he forces the weak player to call off the remainder of the bet because its not much more to go.
So a short stack specialist take care of these two problems, a chip bully who can't use his chip to bluff him off the hand, and a weaker player to call all his chips because the pot is not much more for him to call. Now you see why a short stack specialist is a powerful weapon.
Your second point is correct, the poker gods will bring humble you and bring u back down to earth with those two outers and one outers when you think you got it all figured out. Thats why its EXTREMLY CRUCIAL to have a cushy bankroll and also a mind strong enough not to fall to tilt.
GOOD LUCK!