as a learner and beginner, I have 2 questions about the FRAME Pallets and especially to that overview: https://docs.substrate.io/v3/runtime/frame/--> Substrate FRAME PALLETS:
The highlighted pallets as Aura, Collective, Timestamp (highlighted pallets in the diagram and linked with the Runtime diagram):
1. Are those pallets are necessary for the runtime to work properly? A kind of 'must haves'? 2. If not: What other core message is this overview supposed to convey?
Thank you very much in advance.