I think the ultimate solution to bundling is to go the way of the CLIs, and Angular CLI in particular, where the framework team configures a sensible default bundle config with a few options exposed via the CLI. The user can then build with a single command and everything just works. The user can eject from the CLI and configure manually if needs be, but most of the time that won’t be necessary.

Bundlers probably have a certain minimum complexity that can’t be reduced if they want to be universally applicable, but a lot of that can be hidden for most use cases, particularly if using the same framework.