It does seem like there's a middle ground here, though, where spike marks are noticeable to the cast/crew but not as noticeable to the audience.
I also tend to think that the floor is a deceptively important part of any scenic design that often goes overlooked: a well-integrated floor design can really make or break the believability of a scenic design IMO. I'm always in favor of a good floor design, so in that sense, I agree that it would've been nice for them to add those touches.
But I also feel like this production is already so far removed from trying to convey a real-life forest, that it maybe doesn't matter too much if those touches of realism are missing. I'm sort of ambivalent about this, but it seems to me that audiences should go into this knowing that you're paying for the cast and the material (and maybe the puppetry, lol), and that it wouldn't have been able to transfer to Broadway if not for the conservative finances.