As always this topic goes off a a tangent.
The question was "
Can you tell when the girl has cum?" and not whether it actually matters.
Speaking personally I would say I can tell most of the time, but clearly I am in a minority.
As to the 'tangent' discussion, then of course the punter's enjoyment is of primary importance, but you have to accept that, for some, that is only fully achieved if the wg also orgasms (or appears to)
Telling someone that it doesn't matter, where it does indeed matter to them is a pointless exercise.