That's a lot of benefits! Never realized it til you laid it all out like that.Not a dumb question at all. Asking questions is a great way for all of us to gain knowledge.
Some of the benefits for a dry start:
No water changes/loose pieces floating around/being pulled up
No cycling the aquarium
No fiddling with CO2
No having to buy a lot of plant material initially
No extra electrical cost running other equipment during the dry phase.