Ypu mean the Nazgul on their dragons would just shrug? I’d imagine they have balistas or other warmachines that could make the traveling above Mordor uncomfortable.
Sauron never thought they would want to destroy it. If they did the most obvious beeline towards Mt. Doom, he would realize this and would make it impossible.
Yes, I very distinctly talk LotR only.
As for Hobbit, the Maple films edit made it quite ok and cuts most of the questionable stuff. Still too much Alfrid though. I hated Alfrid more than the love triangle if you’d believe it.