After some thinking, I'd like to re-state the USE_EXPAND variant as having the following advantages:
1) backwards compatible -- we can make the new feature optional for older EAPIs, making it useful for older ebuilds as well. If a PM doesn't support it, it will just treat them as ordinary USE; 2) almost no new learning for users -- as users set flags now, they can set optional deps; 3) dep (or dep groups) would be named by features and not only package names, 4) easy grouping of optional dependencies -- if a particular feature requires more than one optional package, 5) ability to use existing infra -- REQUIRED_USE, metadata.xml for descriptions. -- Best regards, Michał Górny
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