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As has been said as long as the aircraft has vacated the physical runway itself then next aircraft movement can take place.
I beg to differ.
About 70% of our traffic are Heavies and therefore have wingspans exceeding our 60 metre runway width. Having seen several arrivals prop on the rapid exit short of the stop bar for no particular reason, it would be a brave person to fire the next departure just because the tail was past the runway edge.
I seem to recall an incident at LHR involving an aircraft calling vacated and the next aircraft using the runway had to 'swerve' to avoid hitting the fin of the vacated aircraft. IIRC one of them was a VS A346.