Yeah, you don't really need the worm castings and guano. They are the main ingredients in most organic nutes.
The bone and blood are kind old school in my opinion.
I've used just spagnum peat moss, and perlite and gotten excellent results.
Depends on what you're feedin them, soil amendments require less nute feeding because the soil is rich in fertilizers like the added bone, blood, guano, and worm poop.
Think of plain peat and perlite like expanded clay or rockwool, there's nothing there to feed, you have to add the nutes.