Dependencies. For example, the Python TLS library of record is based on OpenSSL. OpenSSL is old and supports lots of platforms. Some people need to use OpenSSL

Dependencies. For example, the Python TLS library of record is based on OpenSSL. OpenSSL is old and supports lots of platforms. Some people need to use OpenSSL because of the platform they're running on. I do hope the situation gets better, and over time we have seen competing TLS libraries replace OpenSSL in more and more places. It's not an easy problem to solve.