Oh, HELL no.

If you’re on probation don’t even think about trying to sit IAH reserve in SFO! The SFO-IAH flights are oversold in both directions year round and a lot of guys (many of them very senior) have to do the two-leg hop thru AUS (or wherever else) to get to IAH.

(I know some guys will reply that the commute isn’t that bad but you’re better off ignoring them, especially during probation.)

Can’t help with much else but the importance of being in position and ready for anything while on probation can’t be overstated. Once you’re done with being a probie then you can add the additional stress of trying to get a seat to and from SFO.