For what it's worth, having Ehlonna and Obad-Hai in the same pantheon is one of the few things about the Greyhawk pantheon that reads as realistic to me. Pantheons are messy and have overlap. And, while some people might sneer at the Goddess of Cutesy Nature, you can't say if gamers really did represent a population of a game world that there wouldn't be a lot of people whose vision of nature would line up with Ehlonna. (Frankly, given the romanticising so many modern Americans do about nature, I think Ehlonna would have a LOT more worshippers than some old fart who was the Green Man before he lost his sense of humor and lusty nature.)
And yeah, Lolth is a million missed opportunities. Moving her over to being neutral evil (I know, heresy) and losing the chaos-for-its-own-sake stuff would be an improvement. Spiders are too iconically methodical to be wasted on chaos.