Hello. Yes, our docs are open for editing so this is working as intended.
We haven't had a problem with spam (because of the captcha?), and so far all IP contributions have been helpful. I always try to assume that most people want to do good and won't actively go out of their way to harm the project and it's worked so far. I hate adding red tape for the sake of it.
Wikipedia has a similar concept - https://en.m.wikipedia.org/wiki/Wikipedia:Assume_good_faith