Going without makeup is never a privilege for cis women. And recognizing that fact, and analyzing the social forces at work here, is not “shaming” the people who wear it.
We are shamed for not wearing makeup. People ask us if we’re tired, or sick. Our careers are penalized for it. (x) (x) (x) Butch lesbians who don’t wear makeup have it especially hard, as they experience prejudice on multiple fronts - prejudice resulting from misogyny, prejudice resulting from being not gender conforming, prejudice from homophobia, and homophobic prejudice of the special variety that lesbians experience - lesbophobia - for the fact that they’re women who are not sexually available to men.
What you’re actually saying is that “women don’t necessarily need to wear makeup in order to be read as female.” And that’s true. I “pass” as a woman whether I’m wearing makeup or not. In other words, I experience misogyny regardless of how well my appearance conforms to socially constructed notions of gender performance.
So, the implication of your conclusion is that these women don’t need to go to an effort to have their “gender identity” validated. This is true, in the sense that I don’t have to do anything special to be read as female. Long hair, short hair, makeup, no makeup, people are going to glance at me and know that I’m female. However, being read as female is never a privilege.
Being perceived as female, regardless of how you identify, makes you vulnerable to both sex-based and gender-based oppression. Not only will you, in the Western world at least, be catcalled and harassed (whether you’re wearing makeup or not), implicitly considered less intelligent than your male counterparts, and be paid less, you’ll be exposed to oppression rooted solely on the basis of biological sex as well. The component of sex in the dynamics between men and women’s power imbalances is immutable. Indeed, it’s the root cause. If you are female, not just perceived as female, you’ll be susceptible to sex-based oppression, however that manifests in your particular culture - ranging from access to contraceptions and abortion, to femicide. Sex-based oppression is a global phenomenon.
I am not privileged for being born in a female body. Period. It is not possible for you to be oppressed on precisely the same axis as you are privileged.
Transwomen who don’t experience dysphoria, and aren’t read as women (or even read as trans), do not experience systematic misogyny. They can’t. Systematic oppression is intrinsically tied to the social world, so indivisible from how we are perceived by the rest of our social network.