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It's not though is it.
If someone says, "we're pretty relaxed and measure you on performance" and then you start and they're fucking militant and don't let you leave unless it's in your lunch break or for an external meeting then that's not reasonable.
If you're told upfront that you need to be work contactable pretty much all the time to jump advise on deals or be expected to attend calls on the West Coast then you know that, and expect it.
Employment contracts can be changed and there is normally fuck all you can do about it. It doesn't stop it being a dick move or preventing you pushing back.
When I started my current job it was definitely sold to me as hybrid, with an expectation to match our clients - "but they're all hybrid too".
Current client (a bank) has gone from from 2 or 3 days (you choose) to 3 days with one to be a Mon/Fri and all MDs and above to be in 5 days.
It's great. It means we can all go and spend our time on Teams calls surrounded by other people on Teams calls. Even when you're in the office it's pointless not being on a Teams call because you're inevitably going through documents or possibly dialing in someone from another office, probably in another country.
Personally I prefer working in an office, but the negative impact on quality of life, plus the added cost (travel and childcare) when my salary hasn't increased with either inflation or to match any increased days in the office means I'd resist 5 days. To the extent I could.
The client has large numbers in India where you often have large commute times, and Women often have care responsibilities for parents and children. Hybrid working has resulted in a huge shift in their m/f ratio because of hybrid working.
Unfortunately when you've spunked money on new offices and a McKinsey report you need to justify it with bums on seats rather than making a decision based on its merits.