I will add to this that we are in a healthy design loop that is tightening in on what I feel is a reasonable final design that is implemented in at least one hi

I will add to this that we are in a healthy design loop that is tightening in on what I feel is a reasonable final design that is implemented in at least one high-performance engine, V8. AFAIK there are Igalia folks trying to get a parallel implementation in JSC to meet the 2-engine bar. GC will not directly make DOM manipulation easier, but it will make it easier to integrate DOM references into a managed language that compiles to WASM, since it obviates the need for indirections through tables. This feature alone is majorly opens up capabilities for WASM on the Web!