That hundred lines has five systems in it, but I could put all ten in if I wanted to with only five or ten more lines. You can pack a shitpot of nested if-then statements into very little space. I do BT separately, but I smash them all into one code. Deconfliction can be a bitch sometimes, though. There is a huge con going in the quant industry that "The little guy can't compete. The only things that work are the subtle things we find with our computers." That is total bullshit.
Pay attention to the little things women do or say that they aren't aware of, especiually when they are drunk. Armed with knowledge you can get them to do the most extraordinary things!