[emersion]

I'm using ES modules for a webapp I maintain, and it's just nice to be able to run it without any build step. Just fire off a local static HTTP server and you're good to go. There's an optional production build step which can be used if desirable.

[incrudible]

I would admit that this gets pretty slow even with a modest amount of files. If you use rollup/esbuild, you can have a very fast build step that may amortize over the increased page load times.