Thanks for the information. Agree, nothing surprising – it's a $300 FF ultrawide lens, and given that Canon 'forces' corrections on the RF 14-35L, I'd be surprised if they didn't do so on the 16/2.8. But I'm also not surprised that if delivers decent images, and a small, light and inexpensive lens that delivers decent images will end up in a lot of people's kits.
Just checked the pictures in Lightroom Classic CC - the most recent one. Lo and behold: Canon does not seem to "hard crop" the pictures when shooting RAW. They appear distortion corrected when viewed in camera, but the RAW itself is completely unaffected. I'll attach some pictures in a few minutes.
See attached image. I cheated a tiny bit, though. The foreground and treetop were gradient adjusted by about a stop, plus 2/3 of a stop overall, because my RP badly underexposed the shot. What drives me nuts - and what I hope Canon will fix in an firmware update - is the distortion corrections in camera. Because if I can crop it myself, I wanna have complete control over the picture I am about to take.
Both were shot at f/2.8 with my RP.