I my have forgotten an odd fixture or two, but as a general rule, the only bath shower fixtures I have seen where the mfg. required GFCI were light/fan units with a metallic baffle.
The local jurisdiction can have it's own requirements.
I would certainly ask. It's not a "challenge" if you are asking to learn.
(not that a challenge would be a bad thing)
Even after many years of inspecting, I have found through a good question, that my interpretations or memory have been incorrect.