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Global using is one of the only new features I'm not a fan of. I get the idea but it can really damage readability.

> "global using" is a code readability regression, so I wish it had not been added and I'd recommend against using it.

As a counterpoint: it's handy for Unit Test projects where you always want to import the test framework.

Yeah, those are optional language features. Namespaces with braces work just fine, and any other language features that are too fancy can be easily disabled in your .csproj (sometimes by downgrading to an older LangVersion).