On this one, I'm in complete agreement with you Darky.

Jockeys have to learn the trade like any other apprentice and we have to give them the chance to do so, but I will never understand why a good horse in a better class race has an unproven jock on board.

It shows up mostly in longer races where tactics play a greater part.
If I were in charge of the training of jockeys, I would introduce them to longer distance races gradually.
Their inexperience far outweighs the few Kgs weight advantage.

Burned my fingers too many times to even entertain the notion of betting on such a horse!

/end of rant

Good luck