Who practices sustainable pace?
Development is an art. Its a mental challenge (emotion if you pair). As a day goes by, an individuals definition of quality changes depending on their mood and energy.
Over short periods of time a team can keep up long hours; especially if there is positive momentum or results in sight.
But permanent hours to get more out the door? Does this really work with out sacrificing quality and practices?
How many times are corners cut to meet a deadline? Was it ever too much to write that test first? Was code copied without refactoring to remove duplication? Is there spike code in production cause it worked?
Is that our risk to take?
Can a person control burnout or realize the compromises they make? People have an amazing ability to adapt to any situation. In a bad situation, we forget, we lie (mostly to ourselves), we ignore and we accept things we shouldn't.