That seems simplistic. What I've seen is the jack-of-all-trades is necessary at the start. As things progress, another person - or multiple people - are ass

That seems simplistic. What I've seen is the jack-of-all-trades is necessary at the start. As things progress, another person - or multiple people - are assigned to each of those "trades". But it's not just that it's specializing, it's that there's more accountability. If you're supposed to be adding function X to module Y, that's much different than "fight the hottest fire". Sometimes people get fired because they insist on acting the way that things that started. From their viewpoint it's even reasonable: they haven't change, the position has. Sometimes people recognize the situation and quit. Being employee number 40 is quite a bit different than 400 or 40,000. Or number 4. Some people are able to negotiate the changes. Some bosses or CEOs can. A lot can't.