Parent's point still stands: PGP is a standard (with widespread adoption, mind you) whereas Age is not. Whether it is a good standard or not depends on how you're using it.
Can you explain why you think it isn't?
Also, very few of these users actually use secure versions such as signal or wire. They all happily post on Facebook‘s messenger and WhatsApp and don’t care about crypto.
WhatsApp uses Signal Protocol, and protects many order of magnitude more messages every day --- or, if you like, bytes of plaintext --- than PGP ever has or will.
Email not being a messaging protocol is... a take.
* https://articles.59.ca/doku.php?id=pgpfan:index
It turned out that PGP is not all that bad...
The sheer volume of gpg-signed apt/rpm/tar packages downloaded and verified everyday cast doubt on your claim.
I bet the number of packages downloaded for CI alone would invalidate this claim.
People use PGP because it is standard, widely-adopted, and does what people need it to do. From where I'm standing, people who argue against these three facts are underestimating PGP or overestimating their own favored solutions.
If you want to change our discussion to be about replacing PGP instead, then I completely agree that people should replace PGP with modern properly-standardized alternatives if such exist.