It is possible to work within the concentration system. With the right stats and gear you can sit in the middle of combat and never have concentration broken - with a sub-optimal build and lacking the positioning and battlefield control to make up for it you'll have concentration broken constantly. I found it very annoying when I started playing but after a while it all started to make sense.
100% agree with this.
IMO, the best line of defense to maintain concentration is not to be targeted/hit at all. And in that regards, AC, saves, etc should be last resort defenses. Ideally enemies are disabled or completely out of reach/sight. In many ways, getting a good initiative is probably the biggest determinant of how a fight will go.
And yes, despite all prevention methods, concentration will get broken.
