Is it the complexity of the solution (LOC), or complexity of the problem? Better abstractions for solutions are great, better abstractions for problems would b

Is it the complexity of the solution (LOC), or complexity of the problem? Better abstractions for solutions are great, better abstractions for problems would be even better, but I'm not sure they'd help all that much for understanding difficult problems... perhaps more data on the problem would help, but that's often lacking.