I sharpened blades for 32 years.
I just buy new ones when it's time, which is about every 4 or 5 seasons. But I don't cut nearly as much as I used to either. I have a 'country yard' meaning I let it grow when it wants to, and I'll cut it down as needed but it's not manicured. I keep the rocks and sticks picked up but that's about the extent of maintenance.