And you're here voicing your opinion, that's awesome.
While you're pretty unlikely to get roads/caravans going before classical era, your ancient era is still painful just to look at
Yes, I feel a little guilty when was writing the table, but was made this way to keep an uniform progression.
I agree that 1 of each yield per tile throughout medieval era is pretty crazy, I mean even if you beeline, getting into renaissance is hard work.
Anyways while I still completely dislike the UA as it is, following your suggestion or just ramping up medieval era yields to +2 while keeping the rest of the table the same would be a better solution.
However if you are still committed to this UA that doesn't have any religious component at all, you should probably rework the religious part of the UB.
Maybe one option to add a bit of a religious component to the UA is add 1 Faith to previous yields only applicable to city tiles (to be clear, 1 Faith in desert city tiles with trade route or road) for example since Medieval ahead.