relay powered voltage regulator ?

Talked to Mark from mad electrical earlier, he was recommending after I finished the amp gauge bypass that I should consider using a relay to power my voltage regulator.after he explained everything, it made perfect sense instead of using power" downstream" from the ignition switch. Instead it would get raw voltage from the alternator and make the charging system more precise. I was just wondering how many of you guys are doing this, and did you notice anything different?