You may call it unnecessary, but I call the lock bar insert a must. Soft titanium vs heat treated steel x tens of thousands of actuations.....regardless of work hardening or anything else....wear is going to occur. When that wear does occur, I would much prefer swapping an insert over replacing a scale.
There are so many credible makers employing this ingenuity that there really cannot be a debate as to the relevance of the innovation. I mean, unless Shirogorov, Hinderer, Sharp by Design, Olamic, Reate, Koenig...You get it....are all just riding the hype....and have been riding for over a decade.
CRK is not immune to material realities, after all.
As for Shiro's screws, they aren't prone to damage so long as you use an appropriate bit with appropriate tolerances. Even if you dont, due to the robust size and depth of the screws, they'll remain serviceable regardless of marring. Unlike many torx pivots.
My Shiro, that I've carried for a little over a month now, has been taken down with a bit, a penny, and my swiss army knife. Just for fun. That's awesome, being able to adjust my knife with my multi tool. Both of which I am almost never without.
The Shiro screws statement is as true and as relevant as the CRK finish showing wear more easily.
Regardless, I believe my sentiment remains in tact. I will admit that it's very probable that a strictly bronze washer maker is able to create a more repeatable product than a maker maker that employs many opening interface modalities. How relevant is that when were talking about top tier level products? In my opinion, not super.
YMMV.