Should this version of Green Bean "Casserole" be served warm?

I made this a few days ago while testing recipes for Thanksgiving. I prefer warm green beans to cold, so at first I added the green beans to the crème fraîche mixture... and the mixture turned to liquid. I tried again with room temperature green beans and a new mixture, and was surprised by how much I liked it. Especially with the hazelnuts, it's definitely not terrible at room temperature. :)

Personally, I would plan to serve it immediately after tossing the green beans with the crème fraîche mixture, so they'd still be warm—but I think the dish would still be fine at room temperature, too.