And if said software screws up and costs a few hundred million, or otherwise causes other "bad things" to happen, what's the accountability of the programmer or the manager?
Nothing. CEO's wreck companies/cause damages all the time, and all that happens to them, personally/financially is NOTHING. Maybe they get fired and then receive a nice golden parachute. Why should it be any different for the programmers who are the architects of the entire groundwork allowing the company to exist in the first place?
Promptness is its own reward, if one lives by the clock instead of the sword.