Last minute changes ( LMCs ) which can mean pax number changes ie no shows , VERY late loading / confirmation of Staff pax etc , if very close to MTOW , some cargo might be offloaded , literally a last minute decision as to which cargo / what it weighs etc . This might involve counting of boxes etc if cargo holds 'Bulk Out ' ie just will not fit in the hold
Very true, among hundreds of other reasons. But how to explain this to the idiotic beancounters spreading around that aberration commonly known as CLC? Bahhh...