> It must have been many many years ago, more than 10 at least.

You would be unduly optimistic — for example, Apple did not support them at least as recently as 2015 (see e.g. https://bugs.chromium.org/p/chromium/issues/detail?id=407093...) and 10 years ago OpenSSL hadn't even shipped support upstream, plus however long it took your distribution to ship a major version upgrade to 1.0.

I was hoping someone might have a pointer to current information on that topic since I believe Apple did finally fix Secure Transport but not when.