A preprint posted to arXiv in May 2026 details drop-tower experiments that measured how three granular materials pack under artificial gravities between 0.015 g and 0.1 g. Using a high-precision linear stage inside ZARM’s short-duration free-fall environment, researchers tracked volume changes in fine basalt (1–200 µm), coarse basalt (2–5 mm), and glass beads (750–1000 µm). Packing density dropped most sharply for the fine basalt—up to 19.6 % greater volume at 0.025 g—while glass beads varied only 4.25 %. The work correctly highlights that cohesion, not particle size alone, drives these differences, yet it understates two operational realities. First, the 4–9 s microgravity windows cannot capture long-term compaction or electrostatic charging that will occur during actual asteroid or lunar operations. Second, the chosen materials omit the highly angular, charged lunar highlands regolith now known to dominate Artemis landing sites. Related peer-reviewed studies in Icarus (2023) on OSIRIS-REx sample return and a 2024 NASA Technical Memorandum on dust lofting during HLS landings both show that cohesive forces scale nonlinearly once electrostatic and van der Waals contributions are included—effects invisible in the 2026 drop-tower runs. Synthesizing these sources reveals that volume swings of 12–20 % will directly affect excavator reaction forces and hopper flow rates on future missions, an implication the preprint leaves implicit. The experiments supply valuable validation data for discrete-element models, but mission planners should treat the reported sensitivities as lower bounds until longer-duration, higher-fidelity tests become available.