My rating of 10 is for the entire series, not specifically for this last episode, just to be clear.
Yes, dear friends, it is an honest statement of fact: Murder She Wrote was the victim of demographics - the show's audience was not attracting enough viewers in the advertising sweet spot of those in the 20 to 35-year old age bracket (ie, "demographic" group), who are thought to be the target audience most willing to spend, spend, spend on the advertiser's products, and so, it went the way of other dinosaurs, and just...disappeared. Ah, well, c'est la vie. The happy news is we'll always have twelve wonderful year's worth of episodes to keep us company on Sunday evenings, and for that, we can be truly grateful. Peace! MFF/Honolulu 8-22-22.