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WRB,

Is it feasible to have an owner option that all “attachments” case to
exist after a certain period automatically disappear (use no storage)”

Sure, select "Delete Old Attachments" in the "Storage Limit Reached" control, at the bottom of the Message Policies panel of your group's Settings page.
/helpcenter/ownersmanual/1/customizing-group-settings/message-policy-settings

This deletion isn't after a specific time, but operates periodically each time your group's storage approaches exhaustion.

It would put the onus on group owners to otherwise organize and
archive those of lasting value, ...

That's one of the unfortunate omissions in this mechanism. Generally there is no easy (one click, or few clicks) way to mark or move attachments which are valuable so that they are excluded from automatic deletion.

Instead you must download them and upload them to somewhere else. And if you're managing a newer (non-legacy enabled) Basic group that somewhere else will need to be cloud storage outside of the group, or re-posted attached to a new message.

Shal


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