Resolve #2997 Top level ESM requiremed by default

[MrWardKKHS]

Proposed changes

Resolve #2997

Checklist

• I have read the contribution guidelines.
• I have linked any relevant existing issues/suggestions in the description above (include #??? in your description to reference an issue, where ??? is the issue number).
• The pull request is requesting a merge into the develop branch.
• I have added necessary documentation (if appropriate).
• If I've added/modified/deleted a third-party system, I've updated the relevant license files.
• I have added myself to the 'Community Contributors' section of csfieldguide/templates/appendices/contributors.html

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc.
Feel free to add any images that might be helpful to understand the initial problem/solution.