Iry, so by taking your argument to the outer limits of the absurd, we arrive to were we currently are....Magic Weapon effects any “nonmagical weapons”.
Sacrosanct, in my opinion, the suspension of disbelief required for a game like D&D, this hybrid of community theatre meets forensic accounting, requires the participants to have a faith in the rules, in order to accept them.
The official, in my view, tortured explanation of unarmed and natural attacks not counting as weapons strains that faith.
I can accept the reality, the ontic facts on the ground facts, that aspects of existence...like quantum effects seem to violate the Aristotelian notion of non-contradiction. A wholly artificial rule set, like D&D does not have to be created with such paradoxes.
I play with savage, a$$¥oles, (I say this with love), that would guffaw if I laid out the ruling.
More importantly such an official ruling is easily subverted because nearly anything can be an
Improvised Weapon.
Cast Magic Weapon on mailed gloves for armored Cestus. Cast the spell on a shield for magical wack a mole. Train your wardog how to joust with a spear tied to it’s back, cast spell on spear. I know my group would happily try to prove this wrong in game, for the sheer fun of it.
(Before the 1st
sixer was done and the whisky comes out, no less)
Respectfully, no thank you...on this official Tweet ruling.