The practice of letting an FO land in limiting weather, especially dynamic weather as stormy crosswinds, is flawed in my opinion. In limiting weather the handling pilot must continually make a decision: can I continue to land or is this all getting too much?
If you hand over control to the FO, either because you lack experience on type or because the FO is a better handling pilot than you, you effectively hand over your command. Who is going to make that crucial split second go/no go decision?
If the captain is not comfortable with the weather, he should divert, even if the FO thinks he can get it in. Otherwise he is a effectively passenger on his own ship.
But then again, once we are in the mindset that 'our FO's are future captains' and that diverting to a stormy alternate with limited fuel is acceptable, well, then all bets are off.