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This is a pretty understandable idea, however if possible a use case would definitely help with making it extra clear to product when a feature like this could be useful. If you haven't, checking out our Submission Guidelines as it goes over the idea process in a bit greater detail.
One of the reasons that this may not be in the base product already is that it's fairly easy to do with 2 tools:
- Use the Input tool, but set it up to get sheet names
- Then use Dynamic Input to read in each sheet.
I know this is a 2 tool solution rather than a multisheet on a single-tool - but it is very effective and simple, so should give you a way forwards for now.