Hmmm? Who said boxing is not complicated, like anything when you start out and have not been immersed in it for some time, it is complicated. The body mechanics, weight distribution, balance, body movement and foot work takes a lot to get down pat...at least for me.
I fully rate your training with other styles and agree with this outlook, I too train with boxers and have paid for one on one training with a top ex-national boxer to better my own hand skills and ring work for just that reason. That's why I also train with the senior jutitsu guy at the goju club and back in the day when I was seriously competing I went to clubs of other styles (kickboxing, muay thai, TKD) and sparred with them.
On your point about boxers simply having a better (hand) striking system than other MAs, such as karate, and not simply because they specialise and focus more on the hand skills than, say a karateka...I follow you. I am not entirely sure about that...if a guy focused solely on the hand (open and closed) skills and techniques of karate and a different guy of similar attributes focused solely on boxing strikes (but also the boxer's movement, ie the whole boxing package) and then they fought bare knuckles, I wonder who would win and more importantly, who would win more often over several fights.
I think you may be right....as my gut feel is that the boxing style would dominate as it is beautifully crafted for an environment where you do not need to worry about sweeps, knees to the head when you are coming in low, etc.
But it is not a simple question, at least not to me but on the whole I would probably concede I agree with you.