Because it just isn’t, which is why you have no one pointing that out as an error.
The rule in 97 was to adopt this -
“If the Referee applies the advantage clause and the advantage which was anticipated does not develop at that time, the Referee shall penalize the original offence."
There’s nothing now in the laws against that guidance. Refs are allowed time, whether they signal or not, to bring the game back if they don’t believe the advantage has been accrued.
This is the guidance now -
- allows play to continue when an offence occurs and the non-offending team will benefit from the advantage and penalises the offence if the anticipated advantage does not ensue at that time or within a few seconds