Solar panels are significant infrastructure investments. Because you don’t just need the panels. You need wiring (possibly cooling) to connect them up and, generally, some form of a bigass battery to store the excess power (or the considerably more complex infrastructure to feed that back into the grid).
We SHOULD be working toward this with basically any decent sized office building having panels and storage. But, short term, we need awnings and trees. Trees especially as they do a LOT more than just provide shade.
As for residential homes? Solar panels are expensive and the batteries are too. But, if people can afford it, it is something to consider.