Let us assume that there is a person who exists in this world, who has given birth or is obviously capable of it, who asserts: "I am a gay woman, meaning I am only into women, I am into penises but not into men, so I would consider a trans-woman as a potential partner."

Now let us assume that there is a person who exists in this world, who has given birth or is obviously capable of it, who asserts: "I am a gay woman, meaning I am only into women, I am only into people whose genitals are similar to my own, so I would not consider a trans-woman as a potential partner."

Is it really helpful to use the same word as an umbrella-term to cover both of their sexual and intimate desires? What extra information or utility does that provide?