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All houses should have shade trees shading them. Mine are elm and pecan. Also I have plenty of spare square footage in the yard to use for panels

It's pretty hard to get your whole house shaded. Plus, it takes a looong time for that - my house was built in 1992 and the oak tree out front is only about 15-20 feet taller than the house. It shades half the front and maybe a bit of the corner of the roof, that's it. The stupid not-crabapple whatever-it-is tree in the back shades the corner between the patio and the fence, so almost no grass grows there. Gives shade to the patio roof, as it's maybe 5-10 feet taller than the house, though I think it's several years younger than the oak.

And many houses don't even have that. It takes decades to grow a shade tree, or way too much $$$ to start big. And I doubt most people have 2-300 sqft of space in their front/back yard that they'd be willing to burn on solar panels...

I was surprised at how fast the pecan grew. I planted it because I wanted pecans. Or as it turns out I really wanted well-fed squirrels. But in 14 years it is now taller than the house although still not over the house.

“It’s pretty hard to get your whole house shaded.”

We live in a world with enormous yearly wobble of the sunlight. Its really a challenge to maintain shade year round. Can’t really be done without also having the risk of falling branches. Insurance companies will dictate many to be trimmed to maintain coverage.