I think the reason UX moved into its own realm (like "UX designer") is to create the processes to get actual UX expertise.
Without deliberate UX expertise, you're on the hook for having UI implementers (software engineers) who happen to be good at UX, and that's not a great way to go about ensuring that you have good UX because you're reliant on serendipity.
And of course once UX becomes its own prong that you're trying to optimize for, the simplest thing to do is create UX positions in your company. Which is much simpler than figuring out how to hire software engineers with UX expertise or good intuitions.
Just consider how few hiring processes involve someone clicking into your github projects and evaluating them just to see what kind of code you write. That's much harder than doing a canned leetcode or canned questions interview.
Without deliberate UX expertise, you're on the hook for having UI implementers (software engineers) who happen to be good at UX, and that's not a great way to go about ensuring that you have good UX because you're reliant on serendipity.
And of course once UX becomes its own prong that you're trying to optimize for, the simplest thing to do is create UX positions in your company. Which is much simpler than figuring out how to hire software engineers with UX expertise or good intuitions.
Just consider how few hiring processes involve someone clicking into your github projects and evaluating them just to see what kind of code you write. That's much harder than doing a canned leetcode or canned questions interview.