* So, yes, I'd agree there's not much benefit to recommend that a TLS-1.2-only implementation add supported_versions, or that an operator look for such an implementation. Any implementation-gated effort is better spent getting to TLS 1.3.
I agree that if you have supported_versions than you probably also have a 1.3-capable stack. But it is also possible to have the first without the second. I think the draft might want to separate those two cases.
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