As an well established 1911 builder and consultant for H&K, when they introduced the HK45 (because a H&K built 1911 would have been too expensive to sell) I think you’ll find that his move away from the 1911 as a combat weapon was based on the maintenance require to keep it running under real life conditions.If a Delta Force guy ever asked me why I had a 1911, I'd say "Because I like them better than the plastic stuff, and they shoot just as well as an H-K does". He's familiar enough with 1911's to know they are a good weapon. I guess it's all about magazine capacity today.
He acknowledged that enough testing had established that shot placement was more important than either caliber or capacity