Absolutely they are great. It's the quickest way to limb independence. Those amazing solos you see all the greats playing, rudiments. Same with marching band.Rudiments are great.. I think they are mandatory in drumming.. I am realizing this by studying fills. My father told me how much he hates technical musician, they need to play with the heart, and I believe him.
But I like a drummer with a strong technical foundation too, it's a mix between 2 things, not just the heart or just the technique.
Just my 2 cents.. before going to bed..
I need to accelerate my practice of the rudiments.
There seems to be a disconnect with rudiments. They arent rules we must follow. They arent how you create fills. You mustn't use them and be aware of it. They arent theory. They dont work like chords. They are just there for limb independence. That's it. If you want your hands and feet to be free from one another, you learn rudiments.
Think of them as tools. They are your hammer, screwdriver, pliers, wrenches, etc. You can do whatever you need with just a few, but the more you have the easier the work becomes.