You wouldn't believe it but you do actually get complaints for being early.
One day with 70+ tail winds we arrived 45mins ahead of schedule. 3 days later the company received a letter demanding compensation to the tune of £15 a head because the family of 5 had to wait 45 mins for their booked taxi to pitch up.
Arriving early can also be a pain if you have un-mins because they have to be supervised until the collecting adult pitches up.
The airlines can't win. Early or late email sent email not sent some bugger will take issue with it.