Ways and reasons for AI and genetic engineering to be absent when cyborgs are commonplace?
So, I want to create a world where cyborgs are commonplace but genetic engineering is absent and AI has not progressed much beyond what was available in the late 2010s; at first, I thought that a religious ban on genetic engineering and AI that allowed cyborgs would do, but, as the accepted answer to that question shows, having these cyborgs without at least the basics of AI and genetic engineering is nigh impossible.
Even knowing it to be extremely difficult, though, I still want to be able to write about cyborgs in all their complexities without having to bring up the societal and philosophical issues posed by AI and genetic engineering.
How can I do this?
Some criteria:
* Artificial body parts must be at least as good as the real thing. If they are no better, this is fine, but at the very least it should be the case that those who choose to become cyborgs for non-medical reasons should not incur a significant disability upon themselves in so doing.
* Related to the previous point, not only should artificial body parts be almost as good as the real thing, but they should be cheap enough to be easily accessible to the middle classes and safe enough to install that doing so would be considered a minimally risky routine procedure.
* Genetic engineering may be present, but should be limited mostly to purposes which are flashy but change little in a day-to-day sense; glow-in-the-dark yeast is fine, but anything that might have serious economic ramifications if applied industrially or agriculturally or which would raise non-superficial ethical issues when applied to humans may not exist in any form which would be viable to use on a large scale.
* Artificial intelligence and machine learning systems more advanced than what existed in the late 2010s in our world should be confined to experimental facilities with little chance of becoming commonplace within the next several centuries.
* If the reason is religious in nature, there must be a good reason why there are not constant schisms over what technologies are acceptable; Barring a religion which is, by both the standards of the present day and most of history, unusually unified, any doctrine which is not directly stated in the most holy texts will inevitably lead to internal controversy, so answers which simply say "religious doctrine is always arbitrary" fail to give a reason as to how all of a religion across the whole world would agree on the same arbitrary line without direct scriptural dictation.
* This world should be inhabited by beings with no obvious differences from our world's modern-day humans, although the culture and geography may be very different.
Just to clarify, when I say I want to be able to write a certain way, I mean that I am looking for a way to do so without having unsatisfactory worldbuilding and want help with solving the worldbuilding issues to that I can write contentedly; I am asking about how to solve strictly the worldbuilding side of the writing and not anything pertaining to the narrative or characters. 64