The results were so mixed, but it also occurred during a global pandemic with massive child caretaking and education disruption so YMMV. All it shows is that people will [ab]use data to prove whatever point they set out to prove.

Ultimately WFH is more economically efficient for worker and employer, so it is up to the employer to prove to shareholders why they should be spending tons of money on in-office aside from "because this is how we've always done it."