Depends on the condo. Some have per-unit hot water heaters and heaters/air conditioners for example, in which case the owner would have to deal with it. But yeah things like roofs and siding would be done by the condo board.

I just got spoiled when I owned a rental where I hired a property manager being able to let the property manager deal with all the maintenance logistics. I was fine being the cutter of checks as long as the property manager dealt with finding good contractors and dealing with scheduling.