Hickory: It's not inconsistent at all. You choose to see it that way, but it isn't. The restriction on page 85 is specifically for druids. Again, Jaheira is not a druid, she's a fighter druid. She possesses fighter skills and traits, as well as druid skills and traits. A fighter may use metal armour. Jaheira is a fighter. Jaheira is a druid. I see no inconsistency.
If you *only* look at it from the point of view of the rules as written in the BG manual and dont try to think about why the restrictions for druids exist, then yes, it is technically consistent. I'm saying that the rules in the manual are inconsistent with the reason for introducing the restriction (see my hypo on kashrut).
It gets even worse when you realize that this is something set out in the
PHB for 2E, which the target audience for this game back in the day would have likely been very familiar with. To quote directly the sections on Preists and Druids respectively,
"All priests have a limited selection of weapons and armor, but the restrictions vary according to the mythos. "
"The druid is an example of a priest designed for a specific mythos." "Unlike the cleric, the druid is allowed to use only “natural” armors -- padded, hide, or leather armor and wooden shields, including those with magical enhancements. All other armors are forbidden to him."
Ergo, the Druid is forbidden from wearing metal armor; it's not that they don't know how to use it, but their specific ethos prohibits it, meaning that it should always apply from a character perspective no matter how many levels of other classes that can use metal armor they have (again, see my kashrut hypo).
But that's just me. If you have a sensible explanation as to why the designers made Druids unable to use metal armor that doesn't involve some connection to their faith, I'd love to hear it.
pi4t: Can you explain why a fighter-cleric multiclass can't use edged weapons, then? The situation seems to be pretty similar to me, and the rules are different for the two options...
This. This is what I have been trying to get across with my kashrut hypo.