But there are many directed at the saint/s themselves, which is why it is puzzling to me.
As to the prayers that begin with "O Saint Philomena, please..." or words to that effect: they generally end with "...through Chrust our Lord."
That's how we understand the process, anyhow. We know very well that Philomena may be a good ol' gal, but she amounts to diddly, spiritually speaking, apart from Jesus Christ Our Lord.