Being a doctor is like debugging a unique humongous software application with thousands of years of organic patchwork added by a godlike AI which just generates random code and watches the failed experiments die, no source code to any of it just the final binary, no debugger that lets you kill the process and dump its memory or trace its execution, just a bunch of test cases that cost lots of money to run and may yield false positives and false negatives making every bug some sort of heisenbug which may or may not show up when you try to reproduce it and reduces you to guessing with some percentage of certainty fuzzy logic, and even if you do manage to figure anything out in your desperate attempt to fix it you're reduced to essentially inserting event objects into the software's internal event system and hoping it produces the desired effects as it circulates throughout the entire system while hoping it won't adversely affect anything else and it's not even guaranteed to make anything better, or alternatively you pry the program open very carefully while it's running and cut code sections which grew tumorous or stitch together other sections which are leaking precious data or remodel the pipes so the data flows more efficiently, all to hopefully fix the problem while praying to god your attempt to fix it didn't actually make it worse because some malware randomly made it into the program while you worked on it.