Interesting thread, especially since I'm going down this path with non Glocks.
First off, ever since I saw compact and C model designations and compared to their full size counter parts, compact? Really?
Best I can tell, compacts are slightly shorter in length and height. Unscientifically, overlayed a P01 and 75B, G17 to. G19.
Trickery, they are nigh identical, shedidng only a few ounces.
I also discovered sub compacts are only slightly smaller again, but it's the grip height vs. slide length that impacts concealment. I think width applies for more form fitting attire and hand ergonomics.
The issue I have with double stack subs is 2 fingers on what feels like a fat grip with flush mag, e.g. G26, Rami P, P224.
The Glock and Sig don'tfeel quite right in my medium sized hands, add the mag extension for 3 fingers, better feel.
The other challenge is the shorter sight radius on an SC, learned that in a class.
And Glock jumps in with a compact, single stack.
Innovative? Not particularly, considering 1911 commanders are sold everyday in 9mm, KAHR is in the niche, and Germanic gun-makers have a history with the P1, P6/225, and P7/8
I entered the arena with a Walther CCP M2
(on sale at Smoky Mountain and they took my PK380 in on trade, $114.32 cash OTD)
Dimensionally it fits between my SDP and RAMI P with flush mag. It has similar weight to the RAMI. Insert the 14 round mag and the CCP and Rami are the same height.
To address width, the grips of a CCP and Rami P are about the same, it's the slide that is thinner and more svelte looking in comparison.
With the posts of prior, "not really a Glock shooter, but like this one," is good for Glock.
10+1 will get you through 80% of the 3-3-3 encounters, an extra single stack mag is usually easier to carry, and less weight in a shootable pistol is a good thing.
Add what you should expect with reliability = happy gun owner.