Most devs switch jobs in 2-5 years (or at least that's the common advice given). So the incentive is to play musical chairs, and hope that you've moved on by the time the music stops.
Software has also been such a new field that it was the startup that moved fast and broke things that got the prize rather than the slow but stable company. I think this is changing (lower barrier to entry and ever-increasing complexity). But the momentum still exists.
Most devs switch jobs in 2-5 years (or at least that's the common advice given). So the incentive is to play musical chairs, and hope that you've moved on by the time the music stops.
Software has also been such a new field that it was the startup that moved fast and broke things that got the prize rather than the slow but stable company. I think this is changing (lower barrier to entry and ever-increasing complexity). But the momentum still exists.