Yes, please (edit: just did it myself, via an old email preferences link). As mentioned above, I have not consciously unsubscribed from either. Do you happen to have the date and time of the unsubscribe action on record?
That sounds like a reasonable granularity. So far I haven’t had the desire to unsubscribe from any Observable mails (as far as I recall), so I may not be the best target for that question.
To be honest, I’m more concerned with the lacking possibilities to opt back in - but your question suggests that this might happen in the near future. 