And the truth is that anyone can clearly see that humanity is split into two categories of individuals with manifestly different clothes, faces, bodies, smiles, movements, interests, and occupations; these differences are perhaps superficial; perhaps they are destined to disappear. What is certain is that for the moment they exist in a strikingly obvious way.
Simone de Beauvoir: The Second Sex
it is not the absence of a penis that unleashes this complex but the total situation; the girl envies the phallus only as a symbol of the privileges granted to boys;
Simone de Beauvoir: The Second Sex
[...] throughout humanity, superiority has been granted not to the sex that gives birth but to the one that kills.
Simone de Beauvoir: The Second Sex
It's still there.
Of course, Thunderbird on Android and Thunderbird on Desktop are both intended to serve very different form factors, so there will be UX differences between the two.