Actually, I'm the first to cringe when it comes to non-Bruce Batman stories, as I'm sure most Batman fans do. It's very uncomfortable at first, but I've learned to accept and respect it. It's an acquired taste I suppose. I much prefer Bruce to anyone else, and for the same reasons you gave. I think Bruce's backstory is what makes Batman so appealing and lays the foundation for what Batman is supposed to be about. But...in the last few years I've been trying to branch out and read more non-Bruce Batman arcs. Bruce Wayne will always be the true Batman to me, but I've learned to enjoy the character development and backstory of the others as well.