UX, CRO and dark patterns

How often UX is just an instrument for CRO?

What is more important CRO or UX?

Some commentators go as far as saying that UX itself emerged because businesses wanted designers not only create pretty things but also «guarantee» high CRO. True?

References

• https://uxdesign.cc/dark-patterns-in-ux-design-7009a83b233c
• https://www.invespcro.com/blog/things-ui-ux-designers-need-to-know-about-conversion-rate-optimization/