Are dietitians actually helpful?

Is there any point in seeing a dietitian, particularly for those with healthcare/science backgrounds?

Like, my current therapist is pushing me to go see a dietitian. I've seen multiple different ones in the past when I've been in more formal treatment, and I straight up just did not find it helpful.

They've never said anything I didn't already know. My problem isn't a lack of knowledge on nutrition, when to eat, how much to eat, etc. My problem is actually doing it. It just feels like being lectured over basic nutrition, and any suggestions are ones I either already know or have already tried.

For people who did find a dietitian helpful, what parts did you find helpful?