Feel free to post this evidence that wfh is not more productive. Everything I have seen has unusual metrics or seems obvious that a conclusion was reached based on what the purchaser of the study wanted.
Wfh is better for documentation and stops side work nobody knows about because you bake it into your business.
Creating a document? Better have Metadata and a reason, and stored publicly. No one off excel sheets, or emailed word docs.
Wikis and collaborative tools are used in the open by everyone, as well as dashboarding and production metrics. Clear defined work processes and workflows are a must.
What happens in hybrid, is people start doing the sticky notes, using email, word of mouth work, and undocumented training/knowledge share.
By publicly. I mean internally, all workers should have access to, and edit rights to, all knowledge.