not sure why you've equated the team's happiness is less important than the software to make the team unhappy. that's an incredibly binary perspective.

there's usually more than two priorities. and i agree with you that a team's wellbeing is important. it should be up there in priorities.

i'm just pointing out that a team that accepts being <some imaginary figure that's not 100% like 70% or 80%> happy, focussing on the software as more important than their own happiness might do better than a team who are trying to focus on their happiness at the same level of priority as the quality of the software.