Fewer vessels in voyage mean less pilotage and this means less income for many Pilots. Not every Pilot is an employee and many pilots are self-employed and organised in a brotherhood per example. They are earning only money if they are piloting a vessel. No vessel – no money.
The Master and pilot are dependant on each other for a safe and successful beginning or end of a voyage. They are both operating in a foreign environment.
Some pilots have already lost their lives because of this non-compliant construction. We don't want to see such an arrangement again. Here is a latest video from the Middle East.