First, I would like to thank Kent for starting this very interesting thread. Kent was a great Smith and shooter. At one time I had one of his builds and managed to take it to a second place overall finish, at the 2016 IR 50/50 Indoor Nationals and actually won the meters portion.
Now to give my perspective of what has changed in the last 10 years. Maybe interesting, maybe not.
10 years ago I was competing with two Winchester 52D's, nothing special about them, they can meet the IR50 factory class rules as is. Today, I am shooting the same 52D's, I did add a tuner to one of them. The majority of the matches I shot at, only allowed a factory action/barrel, no tuner rifle, bi-pod and rear bag, anything else was good. Trigger, scope, ammo.... The only matches I got to use my custom Falcon in, was during the winter at IR and ARA indoor matches and I shot it the same as I did my 52's, off a bi-pod and a rear bag. Could I have done better off a one piece rest, with a 2 oz trigger, a much more powerful scope? Maybe, maybe not. As good as that Falcon was, it actually shot no better than my 52's when I had good ammo for them. The thing the Falcon had that my 52's didn't, was it would handle different lots of ammo better, but when I found good ammo for the 52's, it would be a draw between them. So, I ended up selling the Falcon and shooting the 52's full time. The best I ever did with the Falcon was an IR 1499-118X, the best I have done with the 52's is a 1499-115X. I have shot 750's with both.
Now for me, the only thing that has changed in the last 10 years, is good ammo is much, much harder to find. Fast Lapua works very well in my 52's, but it (for me anyway) is unattainable. So that leaves me filtering thru Eley's offerings. Eley has changed a good bit since 2014, but I have learned to work with. Had to change my cleaning routine to accommodate it. BTW the 1499-115X was shot with 2022 Eley. Now, all the things that have been developed in the last 10 years, such as better actions, firing pins, triggers, scopes, barrels, rest, are to quote Bill Calfee " crumbs on the table " the ammo on the other hand, is a large slice of bread.