Can you elaborate on that or provide a link to where you learned this? According to there site, they only maintain two official plugins for production builds (Webpack & Parcel). I'm coming from using Rollup, so I would prefer to use Rollup instead.
And by that, I take it that it requires ESM module support from the browser, so it really is for development purpose and cannot just be kept used in production that requires wider browser support.
Maybe I'm overlooking something, but that sounds like it's not possible to both debug legacy browsers and reap the benefits of this approach at the same time, defeating the point.
(I presume that people supporting legacy browsers generally have to deal more with their website breaking on those browsers than with things breaking on modern ones)
It's basically a tool that allows you to develop without bundling, but it still bundles for production via Parcel.
So it's not a Webpack/Parcel/Rollup killer.