I've skimmed the posts --which isn't to say I've read them. Too much suspicious yellow liquid.
From the Original Poster, were talking only about the action, right?
The first thing that comes to mind is, if "Savage" were replaced with "40-X", would anyone say anything different? How heavy is the Savage, anyway?
Can a 40-X win? Yes. Best choice? unlikely, especially if you consider cost, where resale value is included in "cost." If cost is no object, then there is nothing wrong with a re-worked 40-X (or Borden/Stiller/whatever/ equivalent). I prefer RBRP anyway.
For many of my rifles, the action is a breech block only -- well, that plus ignition. It might take bunch of work on the ignition system with a Savage -- I don't know -- otherwise, nothing wrong with a Savage breach block.
For the one's I'm talking about, the rifle is barrel blocked, the scope goes on the block, and it's the block that's bedded to the stock. And yeah, as a group they shoot better, with the added cost of making the block, and added penalty (small) of weight.
FWIW
EDIT: in passing, two of those barrel blocked rifles use BAT actions...
Edit no. 2: Another one of them (yup, barrel blocked) is on a 700, but the bolt on the 700 has been reworked to use a Savage bolt head. Two reasons. (1) I can change from a magnum to a .30/06 case head real easy, and (2) I do like the floating locking lugs of the Savage design.