I'm guessing that they're deciding that they don't want to launch with
the loss of avoidable redundancy. If they lose a sensor after they're
off the pad, that's one thing. But would you embark on a cross country
after losing your vacuum system? Why not, you have the electric
instruments that your IFR training showed you how to use as a
backup....?

Same thing with them, plus a healthy dose of CYA, nobody wants to be
'that guy that said launch anyways' right before it asplodes, and turns
out that it's because of a short in the faulty sensor that, I dunno,
caused a leak of LOX into the H2 tank or something.

Ben Hallert
PP-ASEL