Turning a hard problem into a series of problems we know how to solve is a huge part of problem solving and absolutely does result in novel research findings all the time.

Standard problem*5 + standard solutions + standard techniques for decomposing hard problems = new hard problem solved

There is so much left in the world that hasn’t had anyone apply this approach purely because no research programme has decides that it’s worth their attention.

If you want to shift the bar for “original” beyond problems that can be abstracted into other problems then you’re expecting AI to do more than human researchers do.