I rarely see significant use of trees around my home. It's unsurprising that cities mandate them because they provide shade... so if PV arrays confer even more

I rarely see significant use of trees around my home. It's unsurprising that cities mandate them because they provide shade... so if PV arrays confer even more shade, you could stop relying on trees! With a mandate to build a parking lot of a certain size, a business is going to say no trees; they would reduce auto capacity, present a maintenance burden, attract wildlife, and continually drop organic stuff on your customers' cars. And so that's exactly why cities find the need to mandate them!