It's better than "not professional," because that sounds like we're slamming the OP rather than the question, but it's still vague. I think it's trying to convey, "hardware, software, and practices relevant to a business setting."

Splitting it into "wrong site" and "you're doing it wrong" might help, yeah. For "wrong site," perhaps "questions must be relevant to business-class hardware and software" or "questions must be relevant to hardware and software suitable for a business setting." For "you're doing it wrong," "Questions which go against best practices may not be suitable for Server Fault."

It's better than "not professional," because that sounds like we're slamming the OP rather than the question, but it's still vague. I think it's trying to convey, "hardware, software, and practices relevant to a business setting."

Differentiating "wrong site" and "you're doing it wrong" might help, yeah. For "wrong site," perhaps "questions must be relevant to business-class hardware and software" or "questions must be relevant to hardware and software suitable for a business setting." For "you're doing it wrong," "Questions which go against best practices may not be suitable for Server Fault."

Edit: You convinced me. I'm trying to articulate the difference between "I run a small business selling things at conventions. Should I install a DC on a laptop so I can take it to conventions with me?" and "I'm having trouble setting up my minecraft server." I think the first is on-topic (if doing it wrong) and the second is not; my attempt to describe that is "hardware and software suitable for a business setting." (The second person may actually be more knowledgeable than the first, but it's not business software.)