Earlier quoted context omitted.
I think it has to be three days _and_ the airtag has to be in motion
I guess an ill-intentioned stalker could cripple or neuter the speaker to avoid it doing any sounds.
The point is that stalking has always been possible, it’s only important that apple doesn’t make it way too easy. Also when you find an airtag you can bring it to the police and they can get apple to give the owners details. Removing the speaker shows proof of intent.