right, good catch. So its only useful for out-of-box jpeg with no post, works only for lenses that the mfg is motivated to include, can't be updated without a firmware flash, and the feature has the potential to damage the final result. I suspect this is a marketing job to convince buyers that it is good, but as a practical matter it would only benefit those who use the DSLR as a point-and-shoot and are more likely to stick with the kit lens -- and in these situations the user is less likely to even know or detect the benefit and hard pressed to know if it is working well or not!
I do tend to disagree here. I would love my current body to have in-camera CA correction. Why you ask? I don't want to do anything in post but try to get it right when opening the shutter. I'm only a beginner, but I try to learn, and I tend to think that it may be harder but is more rewarding, even though I know that a little bit of post could do wonders.
sure I didn't mean to say it has no use at all I meant to call out that its broadest appeal is likely to occur under situations where it matters least and is most difficult to verify -- meaning a broad set of beginners would not care about the difference, nor would they know whether or not it is working. But you represent a notable exception to that glittering generalization -- you are a discriminating beginner who wants to submit to the discipline of creating good jpgs with no post processing. nice approach! honestly that use case did not occur to me because when I transitioned from film to digital I never did go "without post" -- but my film days brought just the discipline you are submitting yourself to. I sent many a roll of K64 to 925 Page Mill Road, Palo Alto CA.
this is not to say one can't learn digital photography without first shooting jpg with no post. but it will definately help you learn, and allow you to more fully appreciate the flexibility of things like Lightroom when you are ready.
My sense, given your chartered course, is that you will soon (6 months) want to move to raw shooting and transition from "shooting for jpg" to "shooting for lightroom" or whatever PP you choose to use.