Side A implements a substantive DSL redesign (title-first items, explanation-first votes) with real parser logic changes, updated documentation, and extensive test/fixture updates across Rust and Clojure suites, representing meaningful lasting functionality. Side B merely deletes an unused file with no functional change, which is minor housekeeping (though safe removal of dead code has some value, it is far less significant than A's feature work).
A redesigns the core sorter DSL (explanation-first votes, stricter item body placement) with real parser changes in dsl.rs plus docs/UI/fixture updates, which reshape how users write and how the system parses forever. B only deletes an unused timeline.rs module—helpful cleanup, but no lasting product or design contribution.
Side A makes a substantial functional change by redesigning the DSL syntax for items and votes, updating the parser to support block-prefixed vote explanations, enforcing the new grammar with explicit errors, adapting UI generation, and revising documentation and extensive tests/fixtures. Side B only deletes an apparently unused timeline module without introducing new behavior or demonstrating a corresponding architectural replacement, so its lasting project impact is much smaller.