“The word “webmaster” has become dated and quite cryptic. One person managing all aspects of a site is, for the most part, no longer the norm. The term has also become ambiguous, potentially referring to anyone fulfilling any of the following duties involved with managing a website: web architects, web developers, site authors, website administrators, website owners, etc..”
WordPress 5.5 Developer Notes by Jonathan Desrosiers in “Codebase language improvements in 5.5”
I was never particularly fond of the word Webmaster before, mostly because it had a slightly diminutive connotation in the female form, as ‘Webmistress’.
AAUW chapters solved this around 2010 or 2011, when they changed the position to “Web Manager”.
And now it’s official, the core team of WordPress, powering 37% of the web announced it to be “dated and quite cryptic” and replaced with any of the more specific titles.