The operation has apparently been successful, and by the test apps being missing I guess that I really built and flashed the user variant.
Now, I do not expect system updates to work, as I heard that the inari update channel has been shut down.
Though, I would expect it to at least automatically update the third-part apps from the Market store. This does not seem to happen: I have outdated apps (Loqui IM v3.1, in particular) but the "Check now" button from the Settings has no effect (it says "Checking for updates", but nothing else happens).
Moreover, I do not remember of having ever received an update with previous build, so I guess it may be not a problem with this particular build.