Yes, out of Conjuring, Enchanting and Sorcery I would say that Enchanting is the least useful, but at least in this edition it is now just one skill (Alchemy, Artificing and Disenchanting was different skills in previous edition).
Besides creating foci and preparations,
...the Enchanting skill can be used on a focus to learn about the aura of its creator (which doesn't have to be the same magician that currently bind it)
...can be used to deactivate someone else's focus within line of sight (this is also one of the few things you can do from the astral plane even if the owner magician is on the physical plane - and if the owner is using projection too then he or she need to leave the astral world in order to reactivate the focus).
...can be used to break down a focus (but this require touch and take hours).
...and can be used for disjoining preparations (similar to how dispelling work on spells).
So it is not a totally useless skill.
But as I said above, perhaps the least useful of the three (if you are short on skill points and need to skip one of them).