It's annoying to edit by everybody. I guess engineers will especially abhor the unnecessary complexity.

This is the proposal of TFA:

    export const config: MyAppConfig = {
      locale: 'en-US',
      timezone: 'America/New_York',
      logLevel: 'info',
      environment: 'local',
    }

And this is how simple it could be:

    LOCALE en-US
    TIMEZONE America/New_York
    LOGLEVEL info
    ENVIRONMENT local

The first version has 19 useless punctuation symbols and a few spurious words that are not related to the configuration itself, but are constraints of the typescript implementation. The second version is much simpler, easier to write and to parse using trivial string processing, without depending on any third-party library.

It is beyond me how could any serious engineer honestly find any advantage in the first version.