Is UI Designer a stressful job?

Hand crafted UI and UX design will likely transform to curation and product management aspect of UX . IMO, the future of UX is likely to change — Self taught machines perhaps can soon and will iterate 1000 times faster and produce far greater variety than human history has ever.

UX design is relatively stress free . Given that you enjoy doing it, of course. (Low stress level — check). Most of the time UX designers are free to work wherever and whenever they are the most productive.

Good UI design is hard because it involves 2 vastly different skills: A deep understanding of the machine. People in this group worry about code first, people second. They have deep technological knowledge and skill.