By all means read the documents that are actually contracts.

But those are only a few pages. The rest of the documents you have to sign when closing a real estate purchase are mostly boilerplate disclosures about mold, asbestos, flood zones, penalties for fraud, etc ad nauseum. Anything that's actually important in the disclosures you'll already know about if you did your pre-purchase investigation properly. So there's no point in wasting time reading those disclosures in detail during the closing.