At CDG you could be cleared to land with one on the runway and two or three ahead of you on approach!
I suppose the logic is that if the twr frequency is busy and the controller cannot get a word in to issue a landing clearance, the landing aircraft already has the clearance.
Default to land.
Drawback is that if something goes wrong and a go arround is required, if the controller cannot get a word in, the default is land instead of the safer option of GA.
No need for flares approach or runway lights that can be turned red if GA required.