Unless someone starts up a Cosmic bowling tourney, that level of power isn't useful, interesting, or entertaining.
Which is why the manga Senshi are almost never used in crossovers fanfics. The DBZ cast has the same problem; they're just too far out there for the characters of most other series to come close.
That's also why I mentioned that the Senshi I use in RPs are variations on the manga Senshi, mostly just toned-down versions of them with a lot more in the way of skill in exchange for power, and Sailor Moon herself rarely, if ever, appears in my RPs, Admiral Serena aside.