In my experience, I agree: not everyone can put in the same kind of extra effort. And in areas where people are replaceable cogs, this can really hurt some people.

But in knowledge work, if things are hitting the wall and there is pressure to extra-contribute but you are not in a position to put in extra time, you can still respond in a way that visibly shows your commitment.

Express to your management & team your concern about the need for extra commitments and ask-for/suggest ways you can realign your work to prioritize what is most important to the situation.

Nothing makes up for limited additional capacity more than demonstrating that despite your constraints, you are all in to help everyone around you succeed.

Again, this may not work as a low level cog where management isn’t invested in the individuals that work for them. But in other cases, people do appreciate demonstrations of commitment even if you cannot contribute more on some dimensions.

It’s just important to explicitly and visibly show your flexibility and willingness to incorporate others suggestions, on all the dimensions you can adapt.