Roof maintenance is a need in Canada regardless of the presence of solar. Solar roofs do demand additional maintenance but the benefits over relying on natural gas for power (which is the alternative in Canada outside ON/QC) is worth it.

I will stand by your statement from the philosophical point of view that nothing in life is free and everything has its trade offs - but this is a pretty clear positive. In addition, Canada has pretty decent workplace safety enforcement for the sort of workers that'd be doing the maintenance - it certainly isn't perfect but it is something that Canadians seem to find important.