[nchlswu]

> Most UX methods and guidelines come from HCI (and HCI, of course, comes from other disciplines).

I don't think you can simplify it to HCI preceding UX or UCD methodologies.

As you point out, HCI of course comes from other disciplines and just like the field of UX, it's borrowed a lot. HCI, Human Factors, Psychology, etc., all borrow techniques from others (as you've acknowledged)and a lot of what they do has been developed in parallel.

A lot of UX and design methods were developed in parallel by designers with at traditional design background or others without formal research backgrounds. Despite UX being characterized as a science or more rigorous than traditional design, it is largely a pragmatic practice.