My usual answer to questions about why people do things in books and films is "it's the plot, ots suppose to make things more interesting"
Though never stopped my mum wondering why no one ever seemed to need a loo break
Seriously, they addressed this well in the sixties series; I remember at least one episode where everything was resolved because they gave a criminal the Penguin was trying to contact a better paid job. Plus it still meant they could have fun beating up goons too.
Also, in a lot of Batman stories Bruce is doing that, it does come up, but funnily enough it's not exactly the most action packed part of the narrative to focus on.
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Though never stopped my mum wondering why no one ever seemed to need a loo break
*Killed by exploding penguin*