Probably a good idea - In my case we have opted for granite coping and paving.
I have read that it may not always be the best to seal granite if it cannot breathe from underneath.
I don’t think I would seal granite either. I would just have a good cleaning product on hand and try to remove any stains quickly. We were really in two minds about sealing. In our case we are doing it more to protect the grout than the stone. I think the stone itself would have been fine.