J.Quondam
CR 1/8
You've used this specific phrase quite a lot, and it's arguably appropriate for some of the weird proposals being tossed around in this thread.Your bizarre strawmen
But not every conceivable instance that a druid might choose to wear metal armor is a "bizarre" strawman. Not every druid wants metal prosthetics, or iron skin, or is trying to subvert the Circle, or something else. Sometimes they just want to survive, or doubt, or end up deceived. Ordinary, non-metagamey, non-nefarious stuff.
For example (yet again) a druid looking for a way to quickly boost his defense against this bad guy right here right now so he doesn't die is not bizarre. There is simply no good reason* for the GM to deny the player their right to have their own character choose to use or not use a shield in such a basic, very relatable, and more definitely NOT A STRAWMAN case.
Forget the lore for a moment; this RAW can completely contradict the basic human instinct of survival, which is one of those unwritten underlying "rules" like gravity or greed that player's assume in order to operate in the game world.
One of the GM's responsibilities is to correct obviously bad rules.
And this is one of those horrible rules.
Anyway, I get you like the rule. Cool. But please, please, please stop insinuating that those who don't like it are basing that dislike on "bizarre strawmen". Because we're not. We have very good, very legitimate reasons for disagreeing.
* That is correct: Nonsensically hewing religiously to RAW makes no more sense than a druid nonsensically hewing religiously to the no-metal vow.