To me, one of the biggest flaws of the performance center and NXT as a place to train wrestlers for the main roster, is that they should be teaching people the basics and fundamentals of working a match and getting over with a crowd. They should not be developing the character that they are going to debut on the main roster. There are a few exceptions, but by and large, going to the main roster should be a reset button.
Otherwise you get Emma coming out with a stupid dance and no one understands why or what about it makes her in any way endearing. The RAW and Smackdown audiences don't have the context of the entire build of the character, so they're left scratching their heads as to why they should care.
The three most successful guys to come out of NXT came to WWE as a stable, and their characters had absolutely no tie to what they did on NXT. No one gave a shit about Big E until people watched him develop a character in New Day.