These are real questions posted publicly on Reddit. We have linked each thread and answered it from our own job experience in the Bay Area.
Is it more cost effective to remove or replace skylights?
Reddit question · asked on r/Roofing — view the thread
Our answer: Most skylight leaks trace back to installation and flashing rather than the unit itself. If a skylight is being replaced during a re-roof, the flashing kit matched to the unit is what determines whether it leaks.
Always a good idea to get rid of skylights?
Reddit question · asked on r/HomeImprovement — view the thread
Our answer: Not automatically. A modern unit installed with its matching flashing kit during a re-roof performs very differently from an old dome-style skylight sealed in with mastic.