I am also happy that "compact" has been removed from the forum name; I lobbied for that a while ago, and already the Fujifilm G series made the name out-dated. So I will not quibble about my preference for a positive description based on what sort of viewfinder a camera does have: range-finder — SLR — EVF, with "rear-screen only" as the disparaged step-child.
But if "EVF" becomes the default so we could drop it (as I drop the "D" and just say "SLR") we could perhaps divide ILC's by format, with a digital-friendly update of the compact/medium/large division of film cameras formats. The formats for digital ILCs, measuring by diagonal for consistency, seem to be 22mm (4/3"), 27-29mm (flavors of "APS-C"), 43.3mm (36x24), 55mm (44x33) and 67mm (54x40), so I would suggest:
- "small" or "compact": up to "APS-C"
- "medium": 36x24mm "Film Format"
- "large": 44x33mm and up.
Though the mode and median size is of course "APS-C", not 36x24mm, so that has a better claim on being “medium sized”