What from Batman do you think didn't age particularly well?
This scene from Justice League Unlimited to me didn't age very well in terms of Batman have the most advanced tech or being prepared. I remember watching this back when it aired thinking how dumb it was that he didn't have a glider cape. Low and behold 2005 rolls around and Batman Begins introduced a cape he uses to glide. I'd said it for years as a kid that Batman should have a cape that he can use to glide back in the BTAS era. Now we don't think about it much bc of the Arkham games, but he really should've had it all along.