It is the inconsistency
2/16 SAN-SFO - offered water or sparkling wine. Another pax requested a beer was told not until we were in the air. I had water
2/16 SFO-LAS. Nothing offered. Flight had been delayed but so was SAN-SFO - same aircraft. FAs standing around and chatting so no rhyme or reason why no PDB
2/19 LAX-SAN Whatever I wanted as a PDB. I had sparkling water and others had vodka sodas. Aircraft left early.