This has come up in some individual examples like:
- alphagov/govuk-frontend#941
- when Dave was trying to build the GOV.UK Pay example
- alphagov/govuk-frontend#570
- alphagov/govuk-frontend#718
- alphagov/govuk-frontend#514
- alphagov/govuk-frontend#1281
Do a future thinking SPIKE to see when it'd look like if we encouraged nesting as a default for our macros, what would that look like.