There are lawn mowers that operate like Rombas, except they live outside and mow grass. They start at 600.00 with the sweet spot about 1,000.00
The Best Robot Lawn Mowers for 2021 | PCMag
For me that places the payback at about 2 years over a service. I will have to do the string trimming manually, which doesn't bother me.
Yes, YES, YES, YES! I know lawn mowing is inexpensive here, but it is not essentially free after two years.
Do you have any experience with one of these