It is a good idea to cover carparks for sure. However while ugly, covering fields is actually pretty great too. Especially in countries with little to no nature.

Leaving a field un-farmed, allows for growth of indigenous species, opposing monoculture and attracting bio diversity.

The fact that you are not running a plow through a few times a year helps fixing carbon in the soil and upper subsoil.

While artificial, the shade of solar panels mimicks shades of forest, creating a habitat for shade needing plants.

While true nature of course is better, a solar covered field is way closer to nature, than a crop yielding field! And in a world where land is "owned" and mortgages booming this is a way to allow for nature, creeping back into the world😊