In particular, visitors don't care about the definition of “lifehack” or about the scope of the site. This isn't to say that you can completely forget about them when defining the scope. In particular, it implies that the scope must not exclude answers for not being “lifehacks”the scope must not exclude answers for not being “lifehacks”. One thing we do have a consensus on is that the valid questions on this site are a subset of the problems of the form “how do I solve this problem in my day-to-day life?” — so that's what we can expect people to be searching for. It is vital that the answers help the people who find them, otherwise we would be making the Internet worse.
Casual users will usually notice the site name, but they'll rarely care about what is really a lifehack. There'll always be new users who think their question should be on-topic even though the consensus among the regulars is that it isn't. Nonetheless the scope must not be too subtle, otherwise it will have to be explained anew for every new user, meaning that very few will stick around. That's why I propose not to make up our own definition of “lifehack”I propose not to make up our own definition of “lifehack”.