I personally think you don't REALLY need a parse to become good/or better. I'm a ps4 player and I never once used a parser to get better, what I did what look at outside sources about my job and study people's rotation's among others things.

Though suppose in another case would be to see who's holding back the group with a DPS pulling lower dps than a Healer I guess.

However I still would like a parse to upload to FFLOGS myself instead of betting on randoms preying they're going to upload a good run of mine.