Putting 15 supply into a fortified gate without Repair Mastery:
2+2+2+2+2+2+2+3 = 17 WxP
Putting 15 supply into a fortified gate with full Repair Mastery:
5+2+2 = 9 WxP.
Repair masters shouldn’t be getting penalized for getting the job done faster. There are lots of gates out there that need some serious repairs!