Mind of tempest
(he/him)advocate for 5e psionics
you are right but the ability to farm it off to the gods as to why it is everything is not just copy-pasted Europe is a fairly practical idea, also the fallible gods and polytheism just make it easier for quirks to appear.That is not a requirement. Eberron does not have that.
And even if you do, you can have objectively fallible gods. The gods might be real, but they are not necessarily right.
And of course polytheism as standard is a way D&D has always differed drastically from medievalism, with huge cultural implications if you want to follow through with it. "Western values" are historically based on the assumption of a single infallible god. Remove that an you are not going to get the same values.
get a sufficient number of gods to believe it is supposed to be that way and it tends to end up that way it is like giving politicians reality-warping power with no real drawbacks.