Their 'reason' is that they were balanced for the jobs they were put on at the time, to go back and add new jobs to the weapons they would have to be re-adjusted and re-balanced, some of which may be nerfed basically. In short, RUN and GEO are getting the same treatment as BLU, COR, PUP, DNC, and SCH, weapons out before the jobs were out are not included on said jobs. In either case, it seems as though this is not much of a problem anymore as Rag is not the best anymore, Calad is not that great, and RUN is on the best GS now.

Which has been shown with augments close to +38DMG STR+12 WS damage+10, and so far as I know, easily beats a 99Rag at the moment.

*I say close to because I have seen some people claim it is 11STR as an augment, and I did not see it myself, so I do not know the exact stats, but I do believe it had something very close.