It's not very clear that the link provided is a consensus. I understand that not many people see clear the activation.

This is a technical issue, and there is a consensus it's worth trying to use Microdata attributes, as there's no cost.
Nevertheless, following your comment above, I asked at the Scriptorium for more votes on the request.

Change 191192 had a related patch set uploaded (by Gerardduenas):
Set $wgAllowMicrodataAttributes to true at hewikisource

https://gerrit.wikimedia.org/r/191192

Patch-For-Review

Change 191192 merged by jenkins-bot:
Set $wgAllowMicrodataAttributes to true at hewikisource

https://gerrit.wikimedia.org/r/191192