Theoretically - yes, practically, on average, any of the things you’ve listed is far, far, far more complex than your average frontend that is basically glue between “real” logic and user.
If you are doing CRUD simple data apps, I don’t get why your backend will be complicated. Sure the industry has complicated stuff (aws & friends) for complexity sake but that doesn’t mean you have to go down that rabbit hole.
Front-End is complex which is why we have 36362 libraries to solve the same problem and still move user interfaces sucks.
