Not keeping records, does this make me a bad gambler?
Keeping record on your gambling activities only helps you to know how much you may have gambled with within a certain period of time, and likewise how much you may have also lost, but just like O.P said, to me, I don't see any need why anyone should keep such record, because it's just a total waste of time, because either keeping record or not, it won't stop you from losing or neither winning a game, in as much as you are gambling responsibly. Because I think such record is meant to be kept for people who are addicted to gambling, so as to be able to regulate how much they waste on gambling.
But on a general sense, it's literally of no value to either the gambler or casino.
and besides, do you really think some are really doing this tedious task? yes, we know, there are some benefits of doing so however, for me, i think no one can consistently do the recording of all his bets. for me, this task is not sustainable. you may be excited it in the first few months, but later on, it will be a burden for you.
the more sustainable approach would be to spend what you can afford to lose in every bet you want to make. so you have no worries if you will win or lose with your bets.