Do you find Brienne’s lack of suitors believable? I know she’s not pretty and she involves herself in ”manly pursuits” but Tarth should surely make it easy for a suitor to overlook all of that. There must be plenty of second third etc sons who’d jump at the chance marrying her and being a Lord on Tarth. Even if she’s very unconventional it seems very weird to me that Tarth isn’t enough to make sons with nothing overlook it all even in a ragingly misogynistic world like Westeros.