That's probably the first time I've heard someone associate the word "valuable" with an episode like The Child, one of the most poorly adapted and poorly executed episodes of TNG's entire run. The fact that Ian is male kind of contradicts itself anyways.
Pulaski: It's a male human, or in this case half-human half-Betazoid.
Riker: Exactly the same as Deanna.
Pulaski: In every way. In fact, there is nothing to indicate that there are any genetic patterns other than hers.
It's like they wrote the story for Ian to be a girl, but when that didn't work out and they could only get a male child actor, Maurice just said "Just change that one line from female to male. Do I have to think of everything?!?". Except they forgot to change the following dialogue to acknowledge the fact why Ian is male instead of female despite being the same as every.
Isn't that rather making the assumption that Betazed (or half-Betazed) sexual development must be primarily genetically determined, rather than environmentally (as quite a few species are)?
(And even if it is genetically determined, that's assuming Ian is meant to be Troi's clone rather than what one might get from --- assuming Betazed genetics works like Earth-human does --- doubling up the chromosomes in one of Troi's eggs and proceeding from there.)