Wheras I'm unconvinced that they are in fact more successful than other men who are just as persistent/good looking/whatever, but who don't assume secret "biological" reasons behind all of a woman's actions.
And we can debate this until the cows come jome, but neither one of us intends to go looking for proof that will be sufficiently convincing to the other. Thus, agree to disagree.
There's a lot of nuance in PUA literature that I think most people (both PUAs and people who condemn PUA) either lack the willingness or the ability to carefully examine. The fact that you used negging as an example suggests to me that you haven't really spent much time researching PUA-- like obfuscator said, nobody on this forum has said anything about negging within the last 10 years. That's a term that became popularized with Mystery in like 1998, and by 2008 nobody used it anymore both because it's unethical and because it's ineffective.
I don't really want to identify as a PUA or anything because whenever I look at PUA forums, or /r/theredpill, or any subreddit or forum associated with PUA, men's dating, men's rights, etc. I roll my eyes at 99% of the stuff I read there because it reeks of insecure men who can't get laid, but think they understand how things work due to faulty logic and trusting the wrong dating authority figures.
I've been studying PUA literature since like 2005, and experimenting with different things over the years to figure out what works and what doesn't work for me-- and that's a big part of it. What works for me might not work to you due to differences in our physical appearance, personalities, beliefs, and geographical location.
For that reason, I think it's important for men to be "proactive skeptics." Meaning, they should read some piece of advice online, and then they should go out into the real world and see how it works for them. I'd argue that the vast, vast majority of men are too afraid to do that; they'd rather just sit in the comfort of their computer chair, devouring knowledge that they'll never put into practice to determine its validity, while simultaneously boosting their egos as some sort of ladies man because they think they have all the answers, despite not having any experience to back it up.
With that said, there are indeed some pieces of advice that are almost universal for all men to follow, which will definitely help them be more successful with women, regardless of what their goals are, and regardless of what their personal variables are which I mentioned above (appearance, personality, location, etc).
1. Maximize your physical attractiveness: go to the gym and if you're underweight, go put on muscle. If you're overweight, go lose fat. If nobody consistently compliments your hairstyle, go to a stylist and have them give you a fashionable haircut that works with your facial structure. If you never receive consistent compliments on your attire, upgrade your wardrobe and get cool clothes which accentuate your physique.
2. Develop good social skills like a normal human being: get a job which forces you to be social, depending on where you fall on the "social skills" bell curve. If you're in the bottom 10% and you're afraid to make eye contact with strangers, then go work as a cashier where you're forced to interact with tons of people, but conversation is optional. If you're comfortable around strangers but don't know how to talk to them or how to deal with them, then work in sales and you'll be forced to learn that skill.
3. Develop confidence: this comes from both experience and success-- I had to go on literally hundreds of first dates before I got to the point where I'm at now. and I had to get rejected, both online and in person, by hundreds of women as well. most men aren't willing to subject themselves to such a difficult path to self-improvement. it's easier to whine and complain than to put in the effort. but now I'm confident enough to make a move on a woman and see where things go, and I'm confident enough to be completely verbally upfront and straightforward about my desires if I want to be.
#3 is the one where most guys get confused. they don't have the confidence to go out and see what works with them, so they never develop any confidence until they do. they might even know what they "should" be doing, and that it's worked for others, but they still can't bring themselves to do it because they're so terrified. take a look at the relationships thread over the years and it's filled with guys who are too afraid to ask women out or to make a move on them during a date because they lack confidence. and unsurprisingly, those who do eventually break the cycle and make a move find that... it works!