I also would have preferred this to be a job trait rather than a job ability. Having to use Sekkanoki, Sengikori, Konzen-ittai, Kasha, Hagakure, Fudo just for an optimal (and if not resisted awesome) double Light SC is a bit much of a hassle and takes up way too much time in itself to not be interupted by others in a party or zerg situation like said before. Additinoally as Nala said, keeping track of so many abilities is possible but also gets troublesome without illegal help.
Of course the values would have to be lower (say divided by five = 4 save TP and 20TP bonus [personally I'd be fine with save TP 2 already]) but then they at least would be active on all WS rather increasing "DoT" than "spike" damage every 5 minutes and much easier to handle