I agree they are largely pointless, but sometimes they are helpful.
With DD, she was measuring huge, and they were talking C-section because she was not engaged and I had zero signs of progression: no effacement, cervix was high and hard, etc.
Had I shown any signs of progression, we might have gone for a trial of labor or maybe an inducement at 40 weeks. Since there was nothing at all at 40 weeks, and she was ginormous, we did a C-section.
So that's why I had internals with DD. With this LO, we're doing a RCS, so I see no need for internals whatsoever.