[anpat]

On point, I will just add one thing, the split is not really binary. There is a continuum depending on leadership and teams.

Most companies start as latter either because of historical reasons. i.e they already had a dedicated systems/ops team or because a significant majority of engineers are not interested in doing cross functional/vertical product engineering.

I have experienced two such efforts. One where the transition had varying degrees of buy in from whole eng org and happened slowly but successfully, another org where developers kept (indirectly) refusing to own up their systems past build phase and engaged in unproductive turf wars.

As a development engineer nothing is sadder than seeing a fellow dev engineer not giving a damn about either larger picture (why our product exists/why our users's lives are going to be better because of the product) or about how's the system behaving outside of their little bubble of local machine and jenkins.

PS: I do acknowledge that different people have different motivations depending on what's going on in their personal live.