The OC's point was by default, meaning/inferring clear-text is still the modus operandi for generally getting onto IRC services.
>Many applications still aren't encrypted by default, like IRC.
SSL and SASL aren't, precisely, user-friendly implementations with some clients (e.g.: IRSSI[0] - but if you're using IRSSI, you don't want a user-friendly GUI to begin with, so...).
SASL has less to do with the actual encryption mechanism and more to do with the authentication mechanism (think NTLM)[1].
If IRC services dropped clear-text, today, that would go a lot further to standardising (e.g.: making default) encryption but, back to the OC's original point, it is not the default today.
[0] - https://freenode.net/kb/answer/irssi
[1] - https://en.wikipedia.org/wiki/Simple_Authentication_and_Secu...