Yes, partly. But the same is true for all cg jobs. Good riggers understand how to animate, what the needs of an animator are, when a model needs to be fixed vs the rig itself, how to export/import into the target game engine, how to create control rigs to make an animator's job easier, etc.
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If you manage to go throu those insanely good video is the first step.
https://www.youtube.com/c/CultofRig/videos
could you say for rigging it's a problem solving job?
Yes, partly. But the same is true for all cg jobs. Good riggers understand how to animate, what the needs of an animator are, when a model needs to be fixed vs the rig itself, how to export/import into the target game engine, how to create control rigs to make an animator's job easier, etc.
Some of the links here might help you
https://polycount.com/discussion/184948/community-rigs-and-resources