There are various https-only software repos, not only Python or R-relayed. IIRC kernel.org is one of them. Without SSL headers one cannot build tools to access such repos; e.g. there are no such headers in Xcode. One may keep repeating "optional" etc mantras, but it does not make non-functioning tools functioning, SSL is one of feature creeping and becoming de facto standard, just as one cannot really build a functioning single-thread CPython, even though it is officially not acknowledged...
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