I can see integrated QA working for teams because QA personnel would understand project specific constraints and degrees of freedom and tailor solutions in a way that top-down QA cannot.
However, there are situations where less QA may be needed, for periods of time, such as when PRs may be low. QA may be seen as overhead by management, and something to reduce. This will lead to QA shared between teams and a push for standardization and top-down process deployment to minimize complexity for these personnel will develop. Complexity to manage the QA personnel will be shifted to development teams.
This situation absolutely is controlled by company culture. A culture that neither values QA nor development will do this. A company under financial strain will do that. Companies wax and wane constantly.
However, there are situations where less QA may be needed, for periods of time, such as when PRs may be low. QA may be seen as overhead by management, and something to reduce. This will lead to QA shared between teams and a push for standardization and top-down process deployment to minimize complexity for these personnel will develop. Complexity to manage the QA personnel will be shifted to development teams.
This situation absolutely is controlled by company culture. A culture that neither values QA nor development will do this. A company under financial strain will do that. Companies wax and wane constantly.