Even then openssl or sq can solve the problem in the same number of commands but with sntabdards.
Most people are best off going with a modern implementation of the PGP standard, ideally via a smart card to protect you from key exfil via malware.
Tools like Keyfork, Sequoia, and/or openpgp-card-tool are almost certainly what you want for most personal signing, encryption, and authentication use cases.
You get broad compatibility with many many different tools.