- easier maintainance, since you can clean panels with a roomba-like rover instead of walking down with a hose. Replacements don't require ladders and cranes,

- easier maintainance, since you can clean panels with a roomba-like rover instead of walking down with a hose. Replacements don't require ladders and cranes, since panels can be smaller without requiring more support -more heat may be irrelevant and anyway it's speculative -no plants growing under them to constantly be trimming -most places are not flood plains