If transwomen are women, then transmen are men.
If transmen are men, then they should be allowed to inherit titles and estates over their younger natal brothers.
That is the only logical conclusion.
So why is the estates and title exemption retained in the GRA?
Because the government doesn't believe that transmen are truly men, although 'transwomen are women'?
Or because the government fears opportunistic, faked transitions? (After all, if self declaration becomes a thing, and no physical change is expected of a trans person, it would be the easiest thing in the world to fake. Candidates could keep their own sexual orientation and spouse, after all.)
But if this is the reason, why are natal women demonised for fearing opportunistic, fake-transitioning men in women's spaces?