Even so, if we think it's a massive achievement to soft-land the booster somewhere in the oggin it's orders of magnitude harder and more challenging to dynamically place it inch-perfect (as it must be) in the chopsticks.
They’ve just notched up 300 Falcon 9 landings on the crosshairs using the same landing technology. The arms are adaptable enough to accept the demonstrated pad landing variance.
The only things necessary to prove were the scaled up ability of the booster to burn back and relight engines in the same way as the Falcon, and they’ve just shown they can do that.
Accepting, perhaps, another water landing might be prudent, I can’t see where the “orders of magnitude harder” comes into play.