Without getting into Kurt's galaxy-brained take on the declining importance of "production" in a post-AI world, I'd say: yeah, run prod apps on Fly Machines, for more predictable performance, scaling, and pricing. Do exploratory computing --- "figuring out what you'd run on a Fly Machine" --- in Sprites.
The last few hours were a roller coaster after spending my weekend trying to build something Sprites-like on Fly Machines to power a feature in a larger project, then coming across this (great, I don't need to build it!) to realizing this is a seemingly a consumer product and I haven't been saved from an awful slog.