Fralex
Explorer
Conceptually, you'd be fine (just as you'd be fine with a smite-fighter), but in their current incarnations, these two things are quite mechanically distinct - wild shape is an exploration trait that gets turned into a combat trait in one particular druid subclass and that mechanical element would be difficult to preserve in the case of a domain, which serves a more centrally combat purpose. Basically, wildshape as a domain would look very different from the wildshape we have now and serve different purposes. That's part of why wild shape is something distinct, and part of the druid's mechanical identity.
Exactly! And as I was saying a few pages back,
The druid and cleric have several similarities one could point out as an argument for making druid a cleric subclass. They have the same spellcasting mechanic, and both have a powerful class feature that can be used a small number of times between rests. Both have a spiritual flavor to their magic. You could simply make Wild Shape a Channel Divinity feature and make "Druid Domain" spells be a small selection of all the most iconic spells druids have. Use the domain's narrative to add in the druid's flavor. That would definitely result in something which could be described as "the druid option." But few would be happy with it.
The reason, of course, is that demoting the druid class to a small part of another class stifles all the potential it has for interesting variations. The narrative of a druid calls forth many interpretations, and the existing mechanics aren't expansive enough to support them all. You could really only be one kind of druid, even if in your head you have a very specific idea that differs from someone else's idea. And that's no fun!
So, a druid is not just a kind of cleric because although it has similar mechanics and narrative, both are still distinct enough that they invite many varying interpretations of the core mechanics and narrative.
It is for the same reason I feel the artificer should be made into its own class. Yes, mechanically it has enough in common with many other spellcasters to have the unique parts be covered by a subclass. And in terms of narrative, well, it could be thought of as a kind of wizardry. But the core concept of "guy who builds magical things and relies on them for power" invites many more narrative ideas than can be covered in the space of a subclass's supportive mechanics, and that combined with the uniqueness of the narrative and mechanics causes it to cross the threshold into "full class" territory.