This is definitely true for some games, and Early Access is increasingly popular, but for others, QA and testing is definitely a part of the development process

This is definitely true for some games, and Early Access is increasingly popular, but for others, QA and testing is definitely a part of the development process. I interviewed at a game company a few years ago where one of my daily tasks would be to spend an hour just playing the game and seeing if I spot any bugs. I didn't end up taking the job so I didn't see how involved their actual code testing process was, but it was apparent that they actually cared a bit about quality control.