> The time saved … is not worth the additional risk
The time saved is most definitely required for certain airports to maintain their current traffic levels. So we would need a study to understand if the economic impact of the reduced traffic from eliminating line up and wait is worth the expected reduction in accidents.
No aircraft should ever be sitting still on a runway blind to landing traffic behind them. The time saved by eliminating the short taxi from the hold short line to the runway is not worth the additional risk incurred.