If I'm a manager and I notice someone is consistently underperforming (compared to his peers) - it does not matter if the rest of the team is working overtime, or is smarter, or more experienced - I don't care. I will ask the underperformer to step it up (again, don't care if this means working harder, or smarter), and if no improvement after a set period, I will be looking for a replacement. I'm paying top dollar for top performance.
This situation is normal and expected in professional sports. I don't remember hearing about "bad work/life balance", or "being pressured into doing overtime" in conversations about elite athletes' performance. Should we treat elite SWEs differently?