It's a cover your ass statement. In most jurisdictions, giving legal advice without a license to practice law is illegal.

i.e. This is my opinion, take it as you will. If you want proper legal advice, you should be consulting a lawyer.

I think it's a fear tactic of the legal cabal. I've had a judge tell me that I can't help my wife fill out a legal document because that could constitute "practicing law" or "providing legal opinion". It's super ridiculous, but that's how they operate.