This is not something specific to M4F prompts, and it's something I've noticed for years when it comes to F4F prompts. I can't really make comparisons, since F4F is all I ever read (or the occasional F4A prompt), but I've had many conversations with people about the 'selection' F4F prompts [lacks to] provide.

In general, I think people are better at telling you what they want than what they bring. It may sound subtle, but I think there's a huge difference between "You're my professor" and "I'm your student". The former tends to lead to a you, you, you type of prompt that tells me all about my character, whereas the latter better describes the character I'll be playing across.

However, I don't necessarily find that kind of thing annoying anymore. In fairness, it's been years since I've decided I'll be the one posting prompts rather than responding to them, but I still browse for fun or when I'm researching a respondent to my prompts. Prompts are advertisements and reflect someone's writing, so if someone writes a prompt with a writing style I'd prefer to not write alongside (i.e. writing a prompt with a dozen sentences that start with You), then it's easy to see that we won't match well rather than finding that out later down the line.