Have to agree with this one, and also, there is something that I think is easy to forget until you actually face code that has been worked on by dozens of peopl

Have to agree with this one, and also, there is something that I think is easy to forget until you actually face code that has been worked on by dozens of people of completely random backgrounds, over decades: your wisdom doesn't necessarily coincide with someone else's wisdom. Context switching across people - and especially people who barely have anything in common - can be really troublesome. You have to know everything that somebody else you work with has ever used.