That's the remote equivalent of banning informal conversations in the hall and saying "save it for the daily team meeting".
It feels good as a manager to formalize things, but the best collaboration and ideas happen organically at less formal times and places - and those times are worth at least as much, if not more to the company than anything formal.
You might as well say "no thinking about work in the shower."
Ouch, my wife has encountered almost exactly that in a recent brush with a biotech company that seems to have been infected by FAANG expats. She was advised that any kind of sidebar conversation is a faux pas.
I struggled to guess at the real motive. Is it some project manager's blatant control freakery? An org-level, cynical management attempt to commoditize their knowledge workers? Or some kind of emergent failure where culture morphs through openness -> radical transparency -> enforced conformism a la 1984?
It feels good as a manager to formalize things, but the best collaboration and ideas happen organically at less formal times and places - and those times are worth at least as much, if not more to the company than anything formal.
You might as well say "no thinking about work in the shower."