Well, don't assume every BLU is like that.
During the CP campaign, me and family member (BLU+THF respectively), I did nothing but spam Requiescat to open for her RS so that Shantotto would be happy with casting Stone, Water, and Blizzard the whole fight, lol.
In fact, I had to teach her the timing and everything so she could get the hang of it. Worked out much better htan stupid Tenzen screwing stuff up. So we booted Tenzen and got Kupofried in and mobs died faster so we got better XP/hr and then +20% per kill was a nice little cherry on top.
My point in this is, not every BLU is like that. I mean, I wouldn't mind learning the skillchain and hoarding TP to use my WS outside of SC+MB if I had to, or even find some way, regardless of how, to use one of my WS (even equipping a club if I had to) to participate in the skillchain.
Or even not WS at all; if it were to b ea benefit I'd even spam waltz if it meant better performance for the group. Whatever.
Not every BLU tunnel visions 1000% TP CdC.
I do admit, though, that I wish CdC was a better skillchain WS. The SC options just seem so... limited for it despite how effective it can be on its own. But, be that as it may, I'll use other stuff if it will cause more damage in the long run.