Looking at it in hindsight, which commonly used Bat-tech do you wish never existed (I ignoring the one offs). Either because the tech itself bothers you (too silly, too unrealistic, too expensive, etc.) or because you think it's become a crutch or just for some other reason.
For me, it's the impossibly light/flexible armor. Though I'd probably like to ditch the flying bat-vehicles, too, they aren't as bothersome to me. Anyone daring enough to want to eliminate the very noticeable Batmobile and go back to a regular-looking car? Or go back to the pre-grappling gun days?