I just have a medium size suburban style house and lawn.
I looked into Ryobi riding mowers. But instead of taking up so much room in garage, I bought a robot lawn mower Sileno City model, for the backyard. After it has done 3 re-charges of battery, all that remains is edge trimming with a weed whacker and a few spots the robot missed. The robot finds its way back to the charging station automatically when battery gets low, using the guide wire buried 1” below ground, Charges it self and starts mowing again all by itself. What a time saver!
If I had one of those it would get lost but at least it would hit the fence somewhere.
I can see it lost and alone looking for the charger just before expiring having ventured too far from the mother ship.