Kicking aside a classic in the name of corporate profit. Not a new thing, when one thinks of Tikka pushing the T3, Sako the A7, Remington the M700, and the mother of all of them Winchester scrapping the entire pre line in 1964.
Craftsmanship and quality is easily replaced by horrible plastic stocks, poor triggers, and lack of attention to fit and finish. In fairness to Ruger, they would sell 20 or 50 Walmart grade rifles for every RSM. Great rifles, but many people would go a different direction when after semi custom rifles.
I have never owned a RSM, but have owned two M77 tang, and three MkII. The ugly duckling of the bunch was the canoe paddle 7mag MkII. I would side on the three position safety as better. There is a place for a tang safety, and IMO that is on a waterfowl shotgun. Some of the really early tang M77 rifles got a bad reputation for accuracy as it was early and Ruger was sourcing barrels by low bid. Neither of my tang rifles had this problem. Still have one of those, under the category of never for sale.