> "what if I did X in one tab, Y in another, and then Z, all with this exact timing so events overlap"

As a QA: this bug will get downprioritised by PM to oblivion.

If anyone should not exist, it's PMs.

I kid a little, I worked with some very good PMs when we did client work who made my life much easier. Working on a SaaS though, I find them generally less than useful.

Not anyplace that cares about quality.

where I work it is normally easier to fix things than deprioritize to oblivion. I can fix an issue, but priority puts a dozen people in a meeting.

Depends on what happens in that case, no?

If it messes up the UI until you refresh, yeah, I understand deprioritizing that.

If it causes catastrophic data corruption or leaks admin credentials, any sane PM would want that fixed ASAP.