Absolutely agreed, I am struggling to think of many downsides. Maybe some wasps or bees start a nest near a panel meaning it's difficult to clean the panel? Hopefully the nest gets left alone & the efficiency lost is tolerated, to let the bees/wasps live.
I expect in 10-20 years most panel cleaning is done by robots similar to window cleaning robots, with small ramps allowing the robots easy traversal over the whole installation. The technology is directly transferable from vacuum robots and window cleaning robots, with the added benefit of knowing the geometry in advance.
