And it varies from one to another, but always revolves around a general core principle of whatever is convenient to the advocacy at that moment.
I really don't have much of a problem with anything in that quote. So feminism isn't one thing? Fine. Is it two things? Four? Nine? How many things is it?
And if I say I am a feminist, and that means that I am a feminist, unless I am a bro-minist or a faux-minist or whatever, and you get to determine the doctrine and decide why I am disqualified, please by all means ELUCIDATE. If I am a bro-minist (whatever the fuck that means) and I think that might be a bad thing to be, certainly, having these principles and doctrines laid out for those of us interested in supporting our female compatriots might serve as a useful guide to the attitudes expected of a feminist.
So what is the problem with actually DETERMINING THE DOCTRINE? Lay it out. Stop moving the goalposts. Say emphatically and directly WHAT FEMINISM MEANS in as much detail you can stomach. Right now at this moment in time. Put it down in print, decide any leftover issues, and stick with the result. Then let everyone, in the full view of what feminism actually is, even if it is so at a point in time, decide for themselves if they want anything to do with it. It would save quite a bit of time and trouble if those of us "bro-minists" or whatever could just see what was expected of them to see whether or not feminist is a label we choose to wear. Oh, it wouldn't be that we don't support the cause, per se, but it would save us a lot of time if we don't measure up to whatever the bar is at the moment to quit wasting "real" feminists' time with having to deconstruct our failings because we wrongly claimed the label.