Not a bad synopsis, although "Have Gun Will Travel", "Branded" , "The Rifleman" and dozens of other westerns come to mind. It would be difficult to explain the phenomenon if it were not for IMDB.

If we didn't see 'em in real time, they were on syndication - still are ( see Grit TV in all its pharma ad and reverse mortgage ad glory ).

I'm not sure it's really prestige though. Too soapy really. I'll still watch it because it's mildly ridiculous and does a decent job of rewarding willing suspension of disbelief.