as a caveat, what some people dont know or forget or are not aware of is that sometimes you HAVE to pay off certain hands in certain spots to maintain long term +EV.
If you have bottom set in a raised pot on a fout to a flush board you just cant fold bottom set ever. If the guy hs an overset here you have to pay it off.
Same applies with Kk preflop with 100bbs, you have to pay it off because people WILL push with less. KK has 40-50% equity versus AK+ and anyone who would fold psotflop with 50% equity in the pot is retarded hence preflop its a nobrainer.
Sure, you WILL pay off AA with KK, but in the long run all in with preflop with KK = +ev.