The devs built Hired Workers into the game. My guess is, they expect people to use them. If they didn't think Hired Workers should be used in a "Simulator", they would probably remove them. Modders build auto-drive/gps related mods, probably for people to use them.
Also, when I start a new game, I have 3 options:
1. New farmer
3. Start from scratch
A keen eye will notice that option number 2 appears to be exactly what you suggested for the OP.