Why does body hair need to removed?
In my case, because Psoriasis means it fucking itches like hell if it's left on. Removing the hair means that the various treatments actually get into the skin, rather than sitting on the hair and feeling revoltingly sticky whilst doing nothing to help stop the burning, itching, scaling and flaking. Same with the eyebrows.
Why have a manicure/pedicure? Because my back and hip are too fucked to be able to reach my feet and it's cheaper than a podiatrist, and Psoriasis means the nails are very weak and prone to splitting/peeling/getting ingrown. A foot massage helps deal with swelling and pain from inflammation of the entheses. A hand and lower arm massage helps with swelling of the joints and entheses and reduces the likelihood of splits and infections. I can't hold a bottle of nail strengthener to coat my fingernails to stop them snapping off halfway down the nail bed, so somebody else can do it - and if they do gel overlays, those nails will not break at all.
Getting my hair done would mean somebody is able to see if any patches are starting up on my scalp before I do. They can make sure that my hair is in the best condition possible and in a style that is easy for me to look after when I'm unable to lift my arms above my head, stand up or lean over to wash it.
The warmth of somebody blowdrying my hair is soothing when my shoulder and elbow are too swollen and painful to be able to bring a hairdryer or brush to my head. The feel of a scalp massage is soothing and can help stave off a headache caused by an inflamed cervical spine, rather than leave me in pain for days.
If I do not see anybody to speak to and there is nobody to touch me, I'm deprived of something so vital that the absence of both is regarded as abuse. Going to a salon provides something emotionally important that would be inappropriate or fraught with safeguarding risks outside. Other social animals groom one another as part of health and emotional bonding - the DTwatCat1 does't lick DTwatCat2's head because it's sexual, it's a pleasurable sensation for both, the baboon doesn't just pick lice out of another's fur for the handy little protein snacks they provide, it strengthens bonds through feeling nice, from being calm and having relaxed interactions. The reject, the outcast is the one that is not touched. They suffer.
The women denigrating others for doing such things sound just like the abusive men I have known. The ones who want their women barefoot and pregnant and assume that any interaction outside the home is solely to engage in illicit sex with any random male that comes along - heaven forbid that women should get physical pleasure or benefit from somebody touching their hair or body, that anybody should see them or suggest that they are entitled to do something that they like that cannot directly benefit anybody else. How dare they leave the washing up to go and have 90 minutes away from screaming infants or not thinking about their menfolk? How dare they think that the feeling of somebody else's hands on them is something pleasurable when obviously the only touch a woman should have is that of her husband or her children? Comfort can only be doled out through fulfilling one's destiny as the incubator of babies and the receptacle of semen, after all.
Yeah, go for it, campaign to marginalise and shame women into not doing anything that makes them feel good or happy. They're not allowed. The misogynists, abusers and incels will love every moment of that, as having women publicly back them up over it will give them even more power to accuse, berate and beat women for putting their own feelings above those of men.
Or, conversely, fuck off and let women do what they bloody well like instead of backing up the abusive Menz.