Mongoose Traveller - Armor and Encumbrance

Skimming the Central Supply Catalogue, I came across a curious rule in the Armor section (page 133, specifically) stating that armor except for vacc suits do not count towards encumbrance.  This rule, if adopted, changes everything about the encumbrance metagame.  I do not think I like it very much.  However, I understand the intent of the rule - armor, if properly worn, is less encumbering than its weight alone would indicate because the weight is well-distributed.  There are also a lot of heavy, heavy armors in Traveller which are basically impossible to use because they weigh so much.  As a reasonable compromise position, I might be inclined to rule that armor encumbers at half its listed mass.  But no encumbrance whatsoever from most armors seems really unreasonable.