I question it. Inarguably, every microfrontend shipping its own copy of React DOM, Angular Core, etc is wasting bandwidth. Do our customers perceive page slowness due to this lack of optimization? No. Is conversion harmed? No, because we're a B2B SaaS company.

This is not to diminish the work of the Webpack contributors. I still think it's a wonderful feature, and folks with less messy situations (e.g., for organizations still doing micro-frontends, but everyone's using a single UI framework-- their adoption of module federation would likely have less friction) and thus be worth the effort.