Most developers work under constant time pressure and usually with a fixed budget. Choices have to be made. Sometimes ugly code will creep in, because doing better is simply not worth the investment. Many projects don't have a very long lifespan anyway.
Pet project usually get a lot more attention, but rewriting existing libraries is not exactly fun and will require maintenance when made public, so that does not happen often.
Pet project usually get a lot more attention, but rewriting existing libraries is not exactly fun and will require maintenance when made public, so that does not happen often.