I agree with your comments about the unsoundness of the "natural" argument. Should we let our nose hairs and ear hairs grow, as well? (Sorry for bringing that up, but let's get it all out in the open.)
But I think the manscaping phenomenon may soon be over for gay men. After all, fashion trends often start with gay men and eventually become accepted by straight men. I noticed recently that Gillette is advertising a razor for men to use on their chests and other areas of the body, so it's just a matter of time until we will have to reject that "straight" look.
Actually I did have a ex-BF who decided to go "native" after having trimmed & shaved his pubes for years. He once returned from an extended stay in NYC, and we got together for a romp.
I was shocked to see the hair on his balls was long enough to braid - I didn't know pubes could grow that long. His dick was hairy, too. I tried to give him my usual oral attention, but I was gagging. I managed to give him a single blowjob and omitted sucking his balls.
I asked him why he did that. He said he wanted to be natural, and it was popular among some guys in New York. I told him I preferred him his old way, with shaved balls & shaft and trimmed bush, he might get better action that way. Which had looked quite natural, like some guys are normally, not too short and not reshaped. But neither was it suffocatingly overgrown for another guy going down there.
And that's how I keep myself - discretely trimmed to be natural looking in the sauna, but not a choking mouthful for my husband. I think that's a reasonable compromise.