The Coriolis Effect isn't fictitious...
Actually, that's a common label for it. Whether or not it is manifest in our world (spinning globe vs. static plane), in a rotating inertial reference frame it is very real. However, "real" is not the antonym of "fictitious" here, in this usage. I personally don't like "fictitious" either. I prefer "pseudo;" but there is a distinction between it and other non-internal forces, and use of the adjective "fictitious" is part of the physics lingo.
Edit to add that, based on the discussion in the other topic, Sandokhan's version of FET recognizes the reality of the Coriolis Effect (unlike the TFES wiki), but unlike the globe earth where it is a "pseudo force," in his rendition of FET, the force is real. Frankly, I think he makes an intriguing argument that is in stark contrast to the skepticism of the Coriolis Effect's existence.