Fascinating post..Funny that one should deride Walther in favour of SIG, since SIG has had well documented issues with every pistol they make, basically except the SP2022.
Producing a pistol once made with careful hand-fitting to mass produced piece doesn't always translate over so well. It's not as simple as people think. Look at the 1911 as a prime example. Some of those tolerances are +0.000"/-0.000". You can't do that with mass production at a low cost the way people want. the faster you machine something, the more it heats up, and when it cools, the dimensions change.
I just about guarantee the tribal knowledge that folks in ZM, Ulm, and Manurhin learned from producing these for years was lost. There are nuances to these things, and Walther US simply has to relearn them...if they get the time to.
A gunsmith (now passed on) who lived nearby (and who was a smith to the presidential protection detail)....
Once told me that all manufacturing was a sine wave..and that all makers produced their regular pistols with randomly selected parts. Some parts came at the bottom of the wave in tolerance-some at the best (top) part. Once in a while, a pistol was assembled with all top parts-and you can't make them malfunction. But sometimes a pistol is assembled with all bottom parts..and you just can't make it work.
Having once had a Glock 17 that was a horror show and just would not work-his thoughts make sense to me.