The Celestial Incarnae are just more powerful gods, and the Unconquered Sun is still the only one to master the process.
You say that like EX3 is canon or something, rather than a heap of lies and bloat garbed in pretty pictures and soft lies.
And that's not true, by the way. The Incarnae are gods, yes, but they're more than that. No justs. It's the difference between an angel and Lucifer. A wolf and Fenrir. A tree and Yggdrasil. A ring and the One Ring.
Also the questions have the same answer: it costs something big to create the Silmarils or an Exaltation. The light of the Trees of Valinor, the power or very existence of a god, and the skill of a peerless crafstman (Autochton/UCS and Fëanor).
There are countless options for a new god of Keys. Yu Shan has an abundance of very willing candidates, in fact. Nothing unique is needed to make a chosen of keys, just a life.
Of course, you don't need a god of that standing to make an exigent, apparently. A village and a few fields are enough to make an exigent capable of routing an army of the fair folk, after all.
There are many gods. An Exaltation created though one of them is a cheap thing indeed.
Their powers are not hereditary, and require more of the god than to blow their load inside a mortal woman or have their uterus tenanted for a while. It's eternal diminishment or death.
Cheap at twice the price. The Sidereal Exalted have gods killed to forge their jewellery,
this'd be Kejak's wet dream.
So nope, the only ones that should be called glorified Godblooded, by your metric, are the Dragon-Blooded. And lo and behold, they
can make more Exaltations, OMFG OP NERF!
While there are a few Godblooded Terrestrials, the first had no godly blood whatsoever. They're something else, the children of Gaia through her Elemental Dragons.
As for their Exaltation, it's not a personal one like the Solar Exaltation. It's a bloodline, an Exaltation of a family.
Regardless, they've always been the ones that stand out, the exception. The only Exalts who Autocthon had no hand in. The least, but unlimited in number. The perishable Exalted, who could die forever.
If you want to make petty little mocking jabs and call them Godblooded, feel free. I care very little. I've already decided to keep using Ex2. I'm not impressed by the butchery of the setting, I'm not impressed with the butchery of the mechanics, and I'm not impressed with the nonsense of the developers
.