batch extensions - logic all in one, or multiple - best practices

I was wondering if there was a best practice, when doing batch extensions, about how much to do in one extension, and include multiple updates, or if it is better to split that out into multiple tables / extensions? I am about to do some CUB extension logic - and have a few things in mind. Trying to decide if it is good to just put it all in one, or break it up. Thanks!

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