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Don,

I'm assuming the purpose of the #hashtag in the Subject field, is for
keeping all posts responding to this example "My name is Mark #intro"
together for archival reasons. Is that correct?

It goes beyond responses (replies).

The initial purpose was to provide a tag that can be applied to topics as a target for search, mute, and follow functions. These features allow members to find topics of interest (search), and to control whether or not they receive topics by email (mute and follow).

So in the #intro example, a member could seek out other member's introductions ("I'm Shal #intro and I moderate here") by searching the group's topics for the tag #intro. Or could exclude introductions from his/her email deliveries by muting that hashtag. Or, if the member receives only topics he/she follows, can receive introductions by following that hashtag.

Since then a lot of other topic-control functionality has been added to hashtags. Those functions are controlled by the various hashtag options listed under "Uses of hashtags" in the help for Hashtags.
/static/help#hashtags

Shal


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