Wolfgang, I think it will be more easy to work with long list of rules when tags - as groups can be visible as menu like module filter module does it.
Example:
s

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12.png21.21 KBJarviss

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Status: Active » Postponed
Issue tags: +UX
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Status: Postponed » Closed (won't fix)

Not much interest in this for D7.

If you're interested in improving the UI in Rules D8, please install D8 Rules Essentials and contribute there - that project is prototyping UI changes that eventually will be put into Rules.