Those things can't be tested with Playwright et al. So the team had a "every pull request gets an instance like pr143.company.org" pipeline where QA approved. They must still have it.
The other companies tested "on demand."
A few years ago I worked at a company who had a team of QAs dedicated to do manual acceptance tests. Up until the day where a critical regression went unnoticed and it turned out QAs were going through the test suite without actually checking the behavior. Following that the company got rid of all QAs except the software engineer in testing who was responsible for the whole automated test infrastructure, and instead of QAs the team held test days to go through the same manual test suite while we progressively automated them away.
And the whole process improved all across the board.
I also don't find most QA to be worthwhile compared to a good, quality focused dev.
There are several cultural issues with how QA are treated (low pay) and how they think they're expected to behave (e.g. hands off the code, hands off types, hands off unit tests) which make them less useful than a dev who is really good at engineering for reliability.
Where we had good engineering practices and that type of "black box" QA I noticed that product tended to find the majority of bugs, followed by devs, followed by customers, followed by QA.
Only when engineering practices sucked and they were used as a crutch by devs did they really catch a lot of bugs.
Of course, in these days of vibe coded madness they're probably getting more useful, not less.
A buggy release is fine, if it came out faster, and costed less. The bugs in the release can be fixed in the future, and the "heroic" fixes are "creditworthy".
Therefore, over time, the QA team is politically relegated as a "useless" team in the department, and thus given how politics play out, they get sidelined until the entire team is gone.