I've certainly had to go back and make enough corrections of my own when my fingers were flying faster than my thoughts.
As far as comparisons, I was only trying keep comparisons to similar caliber platforms, since the 9/.40 is the hottest growing market outside of .380 ACP. The .45 is still a slower market.
But hey, I'm a long time .45 owner & shooter, myself. Unless they actually come out with a Shield variation chambered in .45 at some point (dunno), I personally tend to think the M&P is at its best in the M&P 45.
(Much like I tend to think the Glock and Walther's are optimal when chambered in 9mm.)
"Pocket (holster)" carry is pretty variable, too. Different folks draw their own lines.
While I have some jackets & coats which work pretty well for pocket carry of my G26's, G27, SW999c & CS9, I'd not be surprised to find that more folks find those too large for their practical use. Then again, I know a couple of guys that pocket holster carry their G26's in slacks & shorts. Different strokes.
I prefer not to use .380 anymore, so a 5-shot J-frame is as small as I'll go for that role (pants/shorts), and the J's work rather well in the role
for me.
Now, once the LE version of the M&P Shield is released in another month or so, it'll be interesting to see if they've finishing testing on a .45 version, and what the dimensions will be for the larger caliber.
If they eliminate the replaceable grip inserts for a hypothetical .45 model (as they did in the 9/40 Shield, to help cut thickness), they might be able to further shave some thickness off a .45 frame. Be nice to see a slimmer slide, too.
Glad you like the XDs 45. It's not a platform for which I have much interest, myself.