[filoleg]

Because you also prevent legitimate uses of such "feature", such as playing games you purchased legitimately from other regions, as that "feature" also allows to defeat region-locking. As for why not just buy those same game versions released in your region, some games were just never released in some regions. Another common use is running legitimate homebrew software.

So logically, it isn't modding/unlocking the console itself that's illegitimate. But it can be used for certain illegitimate actions, yes (along with legitimate ones).

[littlestymaar]

This, or you want to have a backup of your disk because your younger brother isn't especially gentle, or you want to have a second copy of your game so that you can have one at Dad's home and one at Mom's.

And these use-cases aren't only legitimate, in France they are even legal and in exchange we pay a tax whenever we buy a media storage device (Taxe sur la copie privée).