Yeah, it's a shame that Canik stopped making these types of pistols.
A friend and I did a fairly extensive comparison of throat lengths. Even among the same models of pistols, throat lengths were all over the place. My C-100 was the shortest of my pistols. My friend's C-100, only a few serial numbers apart from mine, was about .015" longer. That's actually a fairly small difference within a model from what we've seen.
My C-100 wouldn't accept some bullets loaded to acceptable COALs. One example is the Hornady 115 XTP, which needs to be loaded relatively short even for "normal" throats. I couldn't get it to plunk and spin in the C-100 at even .010" shorter than recommended. Plus, you really want to seat a bit shorter than barely passing plunk to allow for differences in case lengths (which can also vary considerably in 9mm). The short throat made this bullet practically unusable in this pistol. I ran into a similar situation with some lead bullets that had a profile that the C-100's throat wouldn't accept until seated way too deeply.
I examined my C-100's throat with a borescope before I reamed it. There wasn't much, if any, throat visible compared to other pistols. Usually you see a well-defined throat area, but not with mine. Despite using no pressure other than only the weight of the reamer and handle, the well-lubed reamer bit in quite quite hard as soon as I started to turn it. Odd. Due to this, reaming didn't go as smoothly as I'd like, but it worked out ok. I had to ream a little more than I had intended to clean things up. The throat was lengthened by about .040", which is about .020" longer than my current shortest, a CZ-75. Accuracy apparently has not been negatively affected by reaming.
You're right that throat erosion is an issue with rifles, but it's not for handguns firing conventional pistol cartridges. I don't like having to ream throats, but if needed and possible, I say go for it. Nitrided barrels present a problem for this. You can successfuly ream a nitrided pistol throat, but you'll ruin the reamer in doing so. Reamers aren't cheap.