Arrival time makes perfect sense when the objective is getting to work. If I need to be at work at 8am the (hypothetical) bus that gets me there at 7:50 works

Arrival time makes perfect sense when the objective is getting to work. If I need to be at work at 8am the (hypothetical) bus that gets me there at 7:50 works but the one that gets me there at 8:05 doesn't. Simply looking at travel time doesn't tell me I need to sit an extra 10 minutes.