Are antibiotics MID?

This first digital radiograph was taken back in 2007. 
I remember when I first saw him, about 20 years ago I thought his tooth was unrestorable and said I should extract the tooth.  I didn't like the look of the mesial root, and after some discussion, we left it alone.

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 I invested in an intraoral camera in 2013, and this is what his tooth liked then. It didn't look great but was functional.
I bought my Cerec back in 2010, and at some stage, his tooth broke, or I convinced him to try out my new gadget. I don't have a picture, just the radiographs. It looks like it failed! Twice?

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This was the tooth in 2018, and when I retired earlier this year, it was the same. In fairness, I have had a lot of success with my Cadcam. This isn't one of them

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What is interesting is the tooth is functional. I don't remember any problems. No Antibiotics. 
As an older practitioner, I definitely prescribed more antibiotics than is currently advised, especially when I was called out on my own without an assistant on a Sunday. What was interesting is many of these patients never returned for their extraction, and some returned a few years later and requested antibiotics to an extraction—a bit like the guideline for pericoronitis. As a lot of these AAA cases were noted on Compass from last March, I wonder if the data will show the timeline between the initial antibiotics and the final treatment? ​

Do you think after twenty years, he has regretted not having an extraction? Do you think we may be taking out teeth in our best interests, or the patients?