I'm actually surprised how many pilots are not able to follow the PAPI lights. Many times during line training I heard from the PF: I'll go below the PAPI on short final for a smoother landing
Those guys really do not understand the physics of an aircraft...
By the way:
An earlier glideslope indicator system, the
visual approach slope indicator (VASI) is now obsolete and was deleted from Annex 14 in 1995. The VASI only provided guidance down to heights of 60 meters (200 ft)
whereas PAPI provides guidance down to flare initiation (typically 15 meters, or 50 ft).