I also worked at a company where pairing was mandatory for 8 hours a day. Plan was concocted by two tech leads who, of course, didn't pair themselves. The exhaustion was visible, and productivity was very low. Since everyone vocally thought it was a "waste of time", there was a Fight-club-style "rule" where we couldn't talk about the downsides in public or even in Scrum meetings. We missed several deadlines for an MV…
> Imagine a country with two rules: first, every person must spend eight hours a day giving themselves strong electric shocks. Second, if anyone fails to follow a rule (including this one), or speaks out against it, or fails to enforce it, all citizens must unite to kill that person. Suppose these rules were well-enough established by tradition that everyone expected them to be enforced.
> So you shock yourself for eight hours a day, because you know if you don’t everyone else will kill you, because if they don’t, everyone else will kill them, and so on. Every single citizen hates the system, but for lack of a good coordination mechanism it endures. From a god’s-eye-view, we can optimize the system to “everyone agrees to stop doing this at once”, but no one within the system is able to effect the transition without great risk to themselves.
[1] https://slatestarcodex.com/2014/07/30/meditations-on-moloch/