I'm on the (admittedly expensive) EGO system of lawn tools, and I can mow, trim, and blow my entire yard (front and back) in a relatively normal lot (8000 sq ft) on one 10.0Ah battery. It recharges in 2 hours. So I think electric is a touch more practical than your numbers might represent.
But for commercial use I agree, the upfront capex cost is prohibitive. And the need for charging infrastructure (in truck or other) presents an issue.
The truck, yes. A few extra batteries and a charger are somewhat expensive, but within expectation of the job I think. I doubt most locations are entirely without power that they can use. Even public parks often have outlets at specific locations.
In the end the extra battery cost might be cheaper than the gas and maintenance requirements for gas blowers over time.
But for commercial use I agree, the upfront capex cost is prohibitive. And the need for charging infrastructure (in truck or other) presents an issue.