Pull requests enforce coding conventions. The simple fact that someone is going to look at the code you're contributing is enough of an impetus to write better

Pull requests enforce coding conventions. The simple fact that someone is going to look at the code you're contributing is enough of an impetus to write better code. Prevents us from self rationalizing lazy decisions and the like. IMO that is really the idea, to mimic that extra level of care that is taken like when submitting to an open source project.