[whatyesaid]

If most companies become 4 day work week, that would be the new floor and not a perk no more?

You might still have 5 day work week employees who get paid more but to them the perk is money/earlier retirement.

[EForEndeavour]

That's true for all perks: if all firms offered the same perk, that becomes the new floor. But this does not stop companies from offering perks.

[esafak]

Mission accomplished. Otherwise what's the point of increasing productivity? If we can get the work done in less time, we should be able to work less. In an ideal world, we would work as little or as much as we want and be compensated accordingly.