I think that you are absolutely correct on the point that you make here.
D&D has always done a poor job of accounting for the effects that it's magic system would actually have on the game world.
5e Forgotten Realms certainly does not pass this smell test. Nor does any other setting published for 5e by WOTC.
So, you don't like it when settings seem locked in "medieval stasis" and don't take magic or other advancement into account?Caught some similar themed stuff here: http://keith-baker.com/firearms-in-eberron/
Paragraphs of text justifying why 'for reasons' the firearm equivalents in the setting are still not quite good enough to make fighting with bows and swords by PC's obsolete...
If he had just said: "Because D&D" it would have saved him a lot of typing.dd
. . . and then you don't like it when you find a setting that doesn't do this and the creator has explained why either?
What do you actually want?