“Remote work is not compatible with a high ambition level plus high speed,” Pei said in the email, telling employees who are worried about flexibility that “this is a company for grown ups.”

“I know this is a controversial decision that may not be a fit for everyone, and there are definitely companies out there that thrive in remote or hybrid setups,” he added. “But that’s not right for our type of business, and won’t help us fully realize our potential as a company.”

Very reminiscent of Musk's message to Twitter employees a couple of years ago.

"Going forward, to build a breakthrough Twitter 2.0 and succeed in an increasingly competitive world, we will need to be extremely hardcore. This will mean working long hours at high intensity. Only exceptional performance will constitute a passing grade."

And his own attitudes towards work-from-home:

Musk imposed a strict return-to-the-office policy for Tesla in June 2022, warning them they would lose their jobs if they refused to do so. Employees would need to spend a minimum of 40 hours at the office a week; anything less would be “phoning it in.”

“Get off the goddamn moral high horse with the work-from-home bullshit,” Musk said, “because they’re asking everyone else to not work from home while they do.”

“If you want to work at Tesla, you want to work at SpaceX, you want to work at Twitter — you got to come into the office every day,” he said.