I can't speak for everyone voicing against the tactics of resetting with the buff. If there is an exploit w.e. people will use it to get a better time. My only problem with this paticular bug / exploit is that you're essentially resetting your timer mid run. It's as if you're doing a 400M sprint, then reset your timer at the 100M mark.
The instance would not have been that quick if you didn't have the buff from before the reset which took more TIME to get, saying it was done in 10:17m is false.