A name is important, the reason Untitled Goose Game stuck was because the game itself is wacky so a wacky title to accompany it only makes it suit more. (Not to mention big titles like Nintendo advertised it so it’s hard to compare to a Roblox game.) But if you have a serious game idea, especially aiming for a big rememberable title like a simulator or MMORPG I highly suggest thinking of a title that fits.
Since it’ll be the main way people will find your games, through the help of people like YouTubers. Arsenal could’ve been called “Untitled FPS Game” but that would’ve never stuck. Could’ve called Ninja Legends “Untitled Ninja Game” but again that wouldn’t have stuck as well.
Choosing a name that represents your game is something a lot of people don’t think is important, but you have to keep in mind that the name of your game is one of the first things people will see. First impression is always important, no matter the way it’s presented.
And I agree, it’s not always important in certain circumstances, but for a Roblox game I highly suggest making it sound appealing.