because with HoW's introduction of the Ram, the Greaves are now necessary to keep Shoulder Charge as a OHKO. we can knock a ram-wearing warlock straight out of their radiant skin. also, shoulder charging a Titan out of their bubble didn't used to be a thing, and now it is. i still remember the first time i did it after reading about it on the forums... it was a Saint-14 wearing bubblebro who'd set up his disco in that little cave-ish area across from the B heavy in Shores of Time. he just stood there as i ran at him and his full overshield, probably thinking i was just another fool about to get owned by his shotty, but then i hopped into the air and kneed his jaw straight into the moss-lined wall at his back. it was a good day. i used to use the Mk.44's all the time in my forays into the crucible, but now i'm all about the greaves. :3