What do you mean by "easier to find"? Do you mean visually in a list of message subjects? As you can see from the message quoted above, every message already includes a List-Id: header with this information, and X-BeenThere: header with this information *and* a message footer that *also* has this information.
While these are indeed useful for some mail-reading software that has effective filtering that you can use on arbitrary headers, they don't help with, for example, many browser-based readers in which all messages tend to appear together, and where the only indication that you get as to what a message contains is in the subject. Perhaps not an optimal tool, but common enough that they have to be remembered and considered.
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