A fullstack developer on the job hunt should have versions of his/her resume that are tailored for front end, back end, and fullstack. The front end and back end resumes should demonstrate a clear focus on the relevant responsibilities. That's not to say he/she should lie or exaggerate. All it takes is leaving off the impressive experience/skills that aren't relevant. It seems counter intuitive, but the idea is to present oneself as a specialist. For whatever reason, people are suspicious when others claim to be skilled at multiple things
If you're expected to know frontend, backend, and syadmin/devops, how are you supposed to be good at any of the above? You can either be a generalist or deep dive, but there are only so many hours in a day.
A backend dev is usually higher paid than a frontend, so it makes sense.
Very true compared to what I've worked with before too. I come more from a background in backend programming (but typically label myself "full-stack") and recently did my first Node.js project -- getting it live with Nginx took like 20 minutes. That was a pleasant surprise compared to my first experiences with something like Django, for example.