I'm pretty sure dryads and stuff are to balance going the nature-lover route and making it competitive with industrialist society. The dryads from what I see help with things that can be difficult if you are one with nature (like producing wood so you don't have to cut down trees) so I think that these are supposed to be benefits to being anti-industry. Without them it would be shooting yourself to play as druidic nature-lovers because you would lose out on stuff that would be so much easier and faster if you were industrial
Great analysis. This is a big part of it. Without something to juice it up, going the nature-worship path felt too limited. I am fine with different beliefs being harder or easier, but they should all feel rich and interesting in their own way.