Tend to agree. A problem with stats is that they result in a loss of information. If you know only that a player has had 20 kicks, you might be tempted to think he's had a good game. But the '20' doesn't tell you whether they
- were left or right foot - Nope
- were gained under pressure or in space Yep
- were short or long Yep
- went forwards or sideways or backwards Yep
- hit a target or went to a contest or went to the opposition Yep
- were made at the end of a 50m dash or from a standing start Yep
- created attack or held up play Yep
- were snaps or kicks off the ground Yep
and a hundred other things you could gather from watching the game. Coaches would almost certainly rely on their own observations first and foremost.
The most relevant stat of all is shown on the scoreboard, i.e. points for/points against.
Maybe not, as fudge says most clubs are using his data. Sounds as though Sydney isn't one of them. You don't know, so you cannot assume anything