One area that can be improved to prevent WDLs is oil companies making sure HLOs are empowered and encouraged to intervene on the radio. There have been many cases where landing clearance was passed, and acknowledged, without either the HLO having the aircraft in sight at all, or the HLO sighting the inbound aircraft and happily watching it track elsewhere to land on a rig or installation nearby. This assumes he also has his own radio.....
In some cultures (fortunately not all) its an important factor, where there might be significant ramifications if the pilot's authority was ever questioned, so only the minimum is transmitted. This is also more likely where there is poor CRM in the cockpit too, with a dominant 'leader' and a timid (un-empowered) co-pilot ?
This is a very beneficial and proactive safety-related thread chums !
pp.