You know, it occurs to me that the sorcerer-spirit relationship in
@EarthScorpion's take on elemental sorcery is very likely to resemble Summoned Beasts from Naruto.
As a thought sparking from this, we can compare and contrast that to the sorcerer-demon relationship and the demonologist-demon relationship.
From Creation, a demon is an isolated asset. If a demon is trapped in hell, it doesn't matter that you have it as an Ally, it's worthless to you for most things. You might be able to call upon its authority to summon lesser demons who serve it, but you can't directly use Gervasin's killing spear to make Death Of Lots Of Green Spears unless his power can reach you.
So if an elementalist goes out into Creation and makes pacts and alliances with the spirits of nature and tames firebirds and thunder-mice and so on, and a necromancer squats by shadowlands so they can draw up the ghosts they need, and a user of the Black Art tears monsters out of the nightmares of the Neverborn - well, a demonologist is basically operating at the end of a very long supply chain. A demonologist is encouraged to keep a lot of demons around, because you can't just call on the nearest Shadowland or draw power from the Dragonlines. Banishing spells can probably counter demon-anchored magic, too - and banish the demon too.
On top of that, I think while you might be able to anchor a spell in a bound demon, it's probably "worth" less because if the spell is an ongoing thing, it'll terminate when the binding ends. If you want to etch Ligier's name ten thousand times in the walls of your city so green fire consumes any attackers, you're going to need to summon him and
not bind him so he'll invest his power in this. And sorcerers will want to get Demonic Familiars over using bound 1CDs, because a familiar is something you can invoke directly and which can crawl out of Hell when you want to use its power.
If you want to carry out a long duration Working anchored in a demon, you need to summon it and not bind it and negotiate things out yourself. Which is already a very good explanation for why sorcery and demon summoning are looked at with such suspicion - because there's a real incentive there to
release unbound demons so you can anchor your workings in them. Morally dubious sorcerers acquire Demonic Familiars - very suspect sorcerers make arrangements with Second and Third Circles. And that's another reason for the Calibration Feast - you can anchor really, really powerful spells in an unbound Third Circle, with the tiny flaw that you're releasing a Third Circle on Creation you madman.
Hmm, this makes an interesting suggestion of why the Exalted can bind demons, while most cannot. It's a question of implicit Status - because of the Surrender Oaths, the Exalted have an implicit Status (Victors of the Primordial War) that make demons subordinate to them. Demons have accepted their authority by surrendering - and cannot un-accept it. Gods and mortals and the like do not enjoy that status. This clears up the anomaly of why the Exalted are allowed to bind demons when they didn't have sorcery at the time of the Surrender Oaths - it's not that they thought ahead, it's that they realised how to hilariously abuse the Surrender Oaths once they got their hands on sorcery.
This also explains very neatly the difference between Infernal demon summoning and Standard demon summoning. It's not tied under this model to what initiation you learn - it's tied to whether you're using your authority as a victor of the Primordial War or you're doing it under the Law of Cecelyne. Infernals can't bind 3CDs because Yozis aren't allowed to bind each other's souls - and so the status inherited implicitly by Infernals who cast sorcery through Yozi metabiology stops them doing it. And more interestingly, it suggests that Infernal demon summoning can be accessed by infernalists and demonologists who aren't Infernals. All you need is authority under the Law of Cecleyne to do so. Which means that if you serve a demon lord or a demon prince, they can offer you authority over demons so that you can bind them. This is a great thing, because it allows that good ol' trope of "a demon can offer you power to bind lesser demons if you serve them" to be carried out.
Of course, if you're binding demons through Mentor (Ipythmia) and she says "You have betrayed me, so I withdraw my gifts"... well, looks like all your demons are going free. Which provides the chance for hilarity by Nights and Eclipses working to plant evidence so it looks like the cultist-lord of a chunk of the West has betrayed his masters so they withdraw his authority and his empire crumbles.