>>14405463This is a requirement for GLS.
"Upon first docking to Gateway, the Logistics Module mass, inclusive of cargo and payloads,
shall not exceed 14 metric tons (30,865lb).
Note: This requirement does not apply to CLIN 2 missions.
Rationale: An LM upper mass limit of 14 metric tons was used in Gateway Integrated Analysis
Cycle 3. A maximum mass constraint for Logistics Modules protects Gateway Guidance,
Navigation, and Controls (GNC) and Attitude Control System sizing and development. Specialized
delivery missions transporting Gateway elements to Gateway will not be held to this limit;
specialized delivery mission Logistics Vehicle mass limits will be defined in the mission unique
requirements set. "
(CLIN 2 in this context refers to the robot arm delivery, which is an extra 2 tons of mass and will move to the main body of the Gateway after docking).
This contract represents billion of $ of revenue, so I don't see SpaceX pushing the issue.