I know that, you know that, other WFH employees know that. My comment above was tongue-in-cheek; it's studies and reports like the linked PDF that management and Clevel will use to delude themselves and employees to comeback into the office.
The amount of times I had to hold a fart in, struggle to pick my nose, or put on loud earphones just to focus in an open plan office is unacceptable.
Sometimes I want to work elsewhere, and will go to the park or just sit in a parking lot somewhere.
The only benefit I see to physical proximity is the unexpected encounters that can help resolve business situations or help ideas flourish.