Wait so the angels in "Mandate of Heaven" become Bible-accurate angels as they rise the ranks...?
To those having any kind of phobia, please save yourself from not looking into it
OK, so first of all, "Bible-accurate angels" don't exist. Religion for Breakfast made a video to explain the phenomenon, but basically the things now considered "Bible-accurate angels" used to be just other celestial creatures that hung out around God. Later they got "promoted" into "orders" of angels.
Secondly, and this is not fully touched-on in the RfB video, but there is a misunderstanding of what the Hebrew texts say about these creatures, but people closer to the era of the Septuagint actually didn't have this misunderstanding. If you look at early Christian art depicting these things, they all had human bodies. That's because it's actually an inherent assumption of the people who wrote about these creatures that they were all modified humanoids, or inversely, animals/chimeras modifed with humanoid features. So the wheels with eyes all over is just a wrong image based on how people closer to our time interpreted what they read in the Bible. The original texts didn't mean to say these creatures WERE wheels within wheels with eyes all over but that they HAD wheels within wheels AND eyes all over. Greek icons of the early years of Christianity depicted exactly the latter form.
Thirdly, ironically the description of Mandate is closer to what the original Hebrew texts were trying to convey. Gojo is saying that the higher level angels in Mandate don't have a good idea how human anatomy works, so they come up with random approximations. It isn't that angels somehow evolve into different forms as they rise in the hierarchy, but that the already-fixed upper levels of the hierarchy just don't care enough to try to work out how humans are supposed to look like, so they just randomly do the AI thing and make human bodies with too many hands and fingers and limbs and extra bits and pieces that shouldn't go there. Basically think of how billionaire nepo babies think of us plebs and screw up in horrible ways when they try to be "just like us". It's the celestial version of that.
As an aside, there is a funny scene of something like this happening in the manga Touge Oni when Tsukiyomi-no-mikoto (the Japanese moon god) tried to manifest his human form for the first time in ages to communicate with the protagonists. The idea being conveyed in Mandate is a darker version of that scene.