The answer to the druid and metal armor is excellent. Not so much the ruling itself, but the clear way it explains that classes have both story and game elements, and some classes have more story elements than others.
It's a different argument. Regardless of the reasons for the rules on sneak attacks (I think longswords should work myself), player agency is maintained because the restriction is mechanical with clear rules.
Rogue Player: "I sneak attack with a longsword."
DM: "You can attack with the longsword, but your Sneak Attack feature won't provide any bonus damage because it doesn't work with longswords"
This is a different situation from the following,
Druid Player: "I put on scale mail."
DM: "Your character wouldn't do that."
To take it even further, here is negotiation that might go on over the first one.
Rogue Player: "Okay, but I'm going to really try to hit them just right, making maximum use of my Dexterity. I'm going to lay an ambush and everything."
DM: "You do all of that, and I'm granting you advantage on your attack for that perfect setup. However, Sneak Attack only functions with certain weapons, and since you aren't using one, the damage it provides doesn't happen."
Compare that to the druid,
Druid Player: "My druid doesn't give a darn about the rules anymore. He's had enough of this life. Screw nature. I'm putting on the %*&^* armor."
DM: "Your character wouldn't do that."
Druid Player: "But I just did."
DM: "When you decided to play a druid, you decided to play a character who would absolutely never betray that restriction under any circumstances, therefore your character would not do that."
Druid Player: "Are you kidding me?"
Oath Breaker Paladin Player: "Wow, harsh."
It's a different argument. Regardless of the reasons for the rules on sneak attacks (I think longswords should work myself), player agency is maintained because the restriction is mechanical with clear rules.
Rogue Player: "I sneak attack with a longsword."
DM: "You can attack with the longsword, but your Sneak Attack feature won't provide any bonus damage because it doesn't work with longswords"
This is a different situation from the following,
Druid Player: "I put on scale mail."
DM: "Your character wouldn't do that."
To take it even further, here is negotiation that might go on over the first one.
Rogue Player: "Okay, but I'm going to really try to hit them just right, making maximum use of my Dexterity. I'm going to lay an ambush and everything."
DM: "You do all of that, and I'm granting you advantage on your attack for that perfect setup. However, Sneak Attack only functions with certain weapons, and since you aren't using one, the damage it provides doesn't happen."
Compare that to the druid,
Druid Player: "My druid doesn't give a darn about the rules anymore. He's had enough of this life. Screw nature. I'm putting on the %*&^* armor."
DM: "Your character wouldn't do that."
Druid Player: "But I just did."
DM: "When you decided to play a druid, you decided to play a character who would absolutely never betray that restriction under any circumstances, therefore your character would not do that."
Druid Player: "Are you kidding me?"
Oath Breaker Paladin Player: "Wow, harsh."
What "it"? Armour can't just not work.Your reply makes no sense. In both situations there is no justification for the item usage penalty, just a default "They won't use it because it doesn't work."
What "it"? Armour can't just not work.
Even unproficient armour still works.
Or it could just be that their magic doesn't work because being encased in metal armor blocks their connection to the natural world. So sure, a druid in my world can wear metal all they want but can't cast spells while wearing it. They don't have a problem using metal implements because they don't block the flow enough to matter.
Don't like the rule? Ignore it for your game.
If that is true then why are rogues restricted to sneak attacks with ranged or finesse weapons only? There have been complaints about rogues not being able to use clubs and longswords to gain sneak attack. By your logic rogues attacking with any weapon allow a sneak attack because players not rules decide their actions
Player agency is NOT ALWAYS PARAMOUT. When you join a club, fraternity, religion, organization, etc. You agree to be bound to those rules. In the case of divine casters its even more harsh because you are being granted power. It is not inherent to you nor is it a function of training. Even if you have no patron deity you have to be faithful to an ideal, thought or cause as a divine supporter. If you are not, you are stripped of spellcasting and divine powers. Unless there is some anti druid power granting benefits for being in heavy armor similar to patrons for oath breakers and antipaladins you are out of luck, player agency be damned,
Your reply makes no sense. In both situations there is no justification for the item usage penalty, just a default "They won't use it because it doesn't work."
But that's not the rule.
There's no rule "You can't cast druid spells in metal armor" therefore you can cast druid spells same as an other spells.
No, that rule might make sense and would be a hell of a lot more appealing. Instead, you don't have control of how your character acts.
As for "Don't like it, don't use it." a more pitiful response could not be given. Ignoring the fact that it's extremely weak in and of itself, only one person gets to decide that, and it's never going to be the person playing the druid.