Now in the game rules, a shoota shoots further than a catapult
a big shoota shoots a lot further than a shuriken cannon.
Eldar have to compensate for this in the avenger catapult to use hyper-sophisticated targetters and psychic uplinks to bring their weapon up to the precision of your standard shoota.
the in-unverse explanation is shuriken are innacurate weapons that rely on weight of fire to hit targets at short range, because of lack of rifling.
A big shoota fires as far as a heavy bolter, so I an assume orky know-wots involves the knowledge that making things spin stabilize their flight.
That is an assumption though.
So, in universe, is a shoota a more precise weapon than the shuriken?