Like with every "why does X do Y?" question, the answer is "because (and up to the limit that) they can get away with it". Most people seem to accept the "meh,

Like with every "why does X do Y?" question, the answer is "because (and up to the limit that) they can get away with it". Most people seem to accept the "meh, it's good enough" mantra. Perfectionism is considered a flaw - in programming we dismiss it as "gold-plating".