We wouldn't have to keep asking people to check the submission guidelines if, you know, people actually checked the submission guidelines.
Bonus Extra Thought for the Day:
It's not enough to check them. You must actually follow them. Please don't send query letters explaining that you know the project doesn't fit our guidelines, but you think we should look at it anyway. We won't.
who had to take a turn at the generic submissions inbox weeding through proposals for cookbooks, self-help books, sweet romances, erotic romances aimed at male readership, epic fantasies, and too many more unsuitable projects to mention, any of which might be a brilliant book, and none of which we publish.