I have limited experience working in orgs with a QA apparatus. Just my anecdotes:

The one time I got to work with a QA person, he was worse than useless. He was not technical enough to even use cURL, much less do anything like automated e2e testing, so he'd have to manually test every single thing we wanted to deploy. I had to write up extremely detailed test plans to help him understand exactly what buttons he had to press in the app to test a feature. Sometimes he'd modify the code to try and make testing it easier, break the feature in doing so, and then report that it didn't work. In nearly all cases it would have been faster for me to just test the code myself.

The majority of the time I've worked in orgs where there is no QA team, the devs are expected to own the quality of their output. This works okay when you're in a group of conscientious and talented engineers, but you very quickly find out who really cares about quality and who either doesn't know any better or doesn't care. You will constantly battle management to have enough time to adequately test anything. Every bit of test automation you want to build has to be smuggled in with a new feature or a bugfix.

So really, they both suck, pick your poison. I prefer the latter, but I'm open to experiencing what good looks like in terms of dedicated QA.

that sucks, hope you get to work with a good tester/QA person at some point so you get to see what they can do