ESM Compatibility in @metaplex-foundation/mpl-token-metadata

[Dcfgvy]

Umi is described as a zero-dependency library for JavaScript clients. However, I noticed that @metaplex-foundation/mpl-token-metadata (part of the Umi ecosystem, as I understand) is not ESM-compatible and adds nearly 1 MB to the bundle size. For web apps, this is of course crucially important.

Is this intentional, or am I missing something?