I don't see how it's functionally meaningless. Even for a cis-woman, living as a woman is not meaningless.
Women don't have to think about what
"living as a woman" means. Why? because they
are women - they do that without thinking about it, as automatically as you and I breathe and blink our eyes. Women never have to think about, or worry about whether they pass as a woman. All of this is because they ARE female - its innate behaviour, born of millions of years of evolution.
Transwomen, on the other hand, have to constantly think about how they are going to pass for what they desire to be. It is never going to come naturally for them. This is because they are biologically male. They were born that way, driven by their testosterone and millions of years of evolution. This will never ever change. They will never be female.
If you truly believe that transwomen are women because they are indistinguishable from women, then let us all know when you discover one that has the following biological attributes
- has female skeletal characteristics
- possesses a uterus, ovaries, and a vagina
- menstruates
- produces ova
- can get pregnant
- can give birth
Any individual who does not at least one of these attributes cannot be a woman.