I think back-end development is a much more "comfortable" lifestyle (I'm full stack myself), even if lots of it is technically more difficult coding than front end (i.e. multiple threads, databases, load-balancing, etc), because there's a new front end technology that comes out every couple of years, making many of the front end tech stacks become obsolete rather fast and they're super fragmented in terms of large numbers of different and unique frameworks. Not to mention how plagued front end work was for so many years due browser incompatibility issues.
For example, on the back end in Java there's been just basically SpringBoot for a decade, and as long as you keep up with it's minor changes you're all set.
