Yes and no so I'll give a quick nutell summary that may or may not have some technical errors in phrasing. The 2e druid was sort of like a slightly more developed UA type thing iirc & there were so so many system differences that it's almost impossible to compare so lets ignore that. The 3.5 druid had this barkskin which was god damned amazing. In short, you cast it on someone and they get between a +2 & +5 natural armor bonus. Natural armor was almost impossible to get unless you had a race (like monstrous lizardman) that gave it at the cost of a level adjustment or found some PrC that gave it to you. Even if you did that it was an enhancement bonus to natural armor so would stack with it even before adding on the target's armor shield & so on. Druids couldn't use metal armor because it would be so ungodly broke that even the most irredeemable munchkin would admit it would be a bit over the top at least if not more. Druids could wear ironwood armor though (which existed at a high cost making it something a druid might buy or gain by casting a level six ironwood spellSo, this restriction against metal armor for druids is primarily a "fluff thing" and... like most D&D "fluff things" it wasn't very well thought out, and it took a very narrow historical/literary inspiration and applied it very broadly in a "one size fits nothing" sort of fashion. (See the history of clerics and bludgeoning weapons, for example.)
Problem is, if you just shrug and allow druids to wear any armor they want-- you're going to see all your druids in half-plate automatically, and we don't want that, not because it's "overpowered", but because it's weird and it doesn't fit our idea of what a druid is supposed to look like.
Personally, I think D&D could stand to do with a crash course on spiritual taboos that aren't based around punitive consequences, but the character's inability to make the decision to break them. A druid will not wear metal armor. Wearing armor doesn't make them an ex-druid, they have to become an ex-druid to make the decision to wear metal armor. Maybe the one (and only) druid taboo isn't a great example for this, but this is ripe territory for warlocks.
That is why these discussions keep bringing up the lack of alternate armor materials and the god awful virtually worthless barkskin spell in 5e.