IME, people want to play in worlds that feel believable, actually.
....
Some do, sure. It is my preference.
But given the popularity of the 5e FR setting and the AP that people buy to play in it; Lack of believability is obviously not a deal breaker for the people WOTC is marketing 5e D&D to.
This is just the reality of the current situation.
... And there is no reason that D&D worlds need to be what you describe them as, nor do I even agree that published D&D worlds are that. ...
They don't need to be, but to make D&D's setting and system have more internal consistency and verisimilitude when it comes to the Forgotten Realms setting; It would require both a fundamental re-write of the spell lists, and a revision of the assumed power level magic in D&D has. Along with a corresponding re-write to the settings lore to reflect those changes.
The current D&D fanbase is invested in the lore/setting of 5e Forgotten Realms as-is.
I simply do not think such significant changes to both the game mechanics and setting lore in the name of greater believability and verisimilitude would meet an enthusiastic reception with the majority of the current fanbase.
I think that for this goal to be met a new setting would have to be written with corresponding adaptation of the rules system attached.
Similar to what was done with the 5e version of Adventures in Middle Earth.
...However, a few such people per petty kingdom still wildly changes the world. Mold Earth allows easy irrigation, fortification, foundational building, etc. Its pretty gnarly.
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.
...I don’t see how your commentary in the above text adds anything to the discussion, frankly. It’s a drive-by pissing on of a discussion that you clearly don’t care about, and have only apathetic bad “hot take” drivel to contribute.
Yet you hit the reply button... Come on man!
You had to know I'd reply right back when you end with a zinger like that!