Comment by AStrangeMorrow

Yeah for me the three main issues are: - overly defensive programming. In python that means try except everywhere without catching specific exceptions, hasattr checks, when replacing an approach by a new one adding a whole “backward compatibility” thing in case we need to keep the old approach etc. That leads to obfuscated errors, silent fails, bad values triggering old code etc - plain editing things it is not supposed to. That is “change A into B” and it does “ok I do B but I also removed C and D because they had nothing to do with A” or “I also changed C in E which doesn’t cover all the edge cases but I liked it better” - keep re-implementing logic instead of reusing