To be fair Expose wouldn't have really worked either.
Why? I mean, it wouldn't have been good, but it would have worked.
I think he means precisely that, even expose could be use with Youngster, virtually in every case, it simply better to spend this action in a focus, mathematically is the same improvement in offense, but much more versatile.
And you don't need Youngster for a focus.
Draconis is correct: Expose has a higher variance (it can give a three die hit) but it comes at the cost of exposing you for an attack that's not actually better than a focused one because that three die hit is so improbable.
It's worth it if you already have a modifier like Howlrunner I believe but as is focus is better in every way save for the slim chance of a triple hit.
3 hits are 12.5% chance, 2 hits or more are 50%, 1 hit or more 87.5%.
Which leads indeed to the same average amount of damage against agility zero targets.
The interesting thing is: Against agility 4 it turns to be better and if you can add a focus it blows up to being a lot better than 2 dice with focus+rerolls. If you combine 3 dice with howlrunner it becomes 20% better against 3 agi than howlrunner with focus. If you add the usually ace focus+evade token stack those 3 dice have a twice as high chance to strip the tokens as well and do their chance to do damage is twice as high as well. Basically that 12.5% chance of three hits (or 31.5% with howlrunner) is a significant contribution to pierce through token stacks of heavy defensive ships. Crackshot moves this a little bit in favor of the focus token, but 3 attack dice + howlrunner is still 40% more damage than 2 dice + focus.
The bigger issue is imo that you lose one crackshot as youngster would have to take expose and that 20% damage is increased is not worth the 6 points you spend on it.
