It is estimated that every MediaWiki-ResourceLoader module wastes 30 GiB additional traffic per day, even if it is never used. In an analysis done in September 2019, Two-Column-Edit-Conflict-Merge shows up as possibly wasting resources. See https://lists.wikimedia.org/pipermail/wikitech-l/2019-September/092541.html for full context.
T232728: Create a dependency graph of existing RL modules provides a tool to analyze module dependencies and find candidates that can be merged.