While I don't have a 22Val, I have gone through a couple of 22-250s and 22-250 AIs and a few barrels. None of them were fast twist but I did learn in particular with the AIs that when over 4,000 fps the leade and first few inches of rifling gets roughed up pretty fast. I expect with heavy bullets and stout loads erosion will be a thing with the Valkyrie too, What I eventually learned after 40 years was that a bore scope and an equivalent to Tubbs Final Finish (a kit to coat your own bullets with non-embedding lapping compound) can help prevent blowups. You wouldn't think it would be an issue with 1-14 barrels (the AIs) but pushing a 40 grainer to 4,300 fps (a lot of 4064) and blue smoke can appear (six groove button rifled barrels 26 inch). When erosion gets going it's a pretty rough surface and fire cracking looks like a coarse bastard mill file. Now lapping won't make erosion and early fire cracking go away but it does knock of sharp edges and smooth things out a little. I got a few more rounds down the old barrels waiting for replacement barrels.
My view is fast twist barrels put a quite a bit more stress and heat into a bullet, some rifling profiles can put more stress on a jacket, any roughness or burrs can put stress on a jacket. I couldn't say if the jacket is weakened, or if the core melts a little where in contact with the jacket or whatever. Just that in a small sample of slow twist barrels and maximum velocity, insuring a smoother leade and rifling helped.
Usual disclaimers, worked for me and my specific firearms, barrels and loads yadda yadda. Your mileage may vary due to any difference at all and maybe no difference.