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Indeed, I don't understand this statement A type that can be used in runtime structures in docs: https://paritytech.github.io/substrate/master/sp_runtime/traits/trait.Member.html

I noticed that some associated types in Config trait (like Index, BlockNumber, Hash,...) have defined Member trait, but the rest are not.

I have some questions:

  1. When do we use Member trait?
  2. What is the purpose of Member trait?
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This trait seem to have been added years ago and hasn't had much change ever since. I think the primary purpose is to simply be the super-trait number of other sub-traits and be used for any type that needs to be bounded by all the sub-traits.

You can and should use Member in any place where the set of sub-traits is what you already wanted to bound something by.

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