TerraDave
5ever, or until 2024
Actually,if you want to get technical, that means it is very much not a splatbook. You could call it a supplement (though, what other "supplements" also contain the fullness of the base rules?), but it isn't a splatbook.
Let us remember the origin of the term, "splatbook". It was used to describe the supplements for White Wolf's original World of Darkness games - each book was focused on a particular faction or character type. There was an Uktena-tribe book, a Tremere-clan book, A Euthanatos-tradition book, and so on. Online, these were referred to collectively as *books, as the asterisk was common notation for a wildcard. And, the asterisk is also known as a "splat".
Thus, a splatbook is a supplement that focuses on a particular class, group, or faction of character. Since the PHB is broad and unfocused, it isn't a splatbook.
Which goes to show you - do not start with the phrase, "if you want to get technical...," if you aren't actually technically correct, as some goober like me will point it out!![]()
Actually, what was first? The 2E fighter book, factions books from a semi-rpg like battletech or warhammer, or something else?
That fighter book was early. Part of late 1e/2es ability to be both pioneering and outdated at the same time.