But Golarion is still a big place and Pathfinder has a lot of tones.
"We're going to start a new Pathfinder campaign" doesn't tell you much, other than mechanically. It could be a dungeon crawler, a high fantasy game, a horror campaign, weird science, pirates or even more.
"We're going to start a new Vampire: The Masquerade campaign," in contrast, narrows things considerably. Maybe it'll be a political game or an Underworld style battle against other supernatural beings, but if it's not one of those, you'll be able to squint and see those play styles from within your campaign.
"We're going to start a new Pirate Borg campaign" or "we're going to start a new Mothership campaign" or especially "we're going to start a new Eat the Reich campaign" or "we're going to start a new Deathmatch Island campaign" tells you almost everything you need to know.
"We're going to start a new D&D campaign" could mean almost anything. If you want to recruit someone to play in your campaign, you have to explain a lot to get them to know what to expect, even generally.