If course we're supposed to read it but in some situations it's not realistic. Buying a house involves hundreds of pages. Unless you're a lawyer, the average person isn't going to recognize loopholes in the contracts. And I don't know many people who would back out on a house sale at that stage, so it's highly unlikely you'd refuse to sign. The only practical way to do that is to get an advance copy of everything.
In these cases you really do need a lawyer who you trust has read the documents and is protecting you.
I read each and every page before I purchased my home. I highlighted everything I didn't understand. Most pages looked like bumble bees. I worked questions during a 5 hour session with my realtor. For terms I now understood but didn't agree with, I had two options depending on the type of term it was:
1. Government and HOA stuff was not changing. I could accept it or walk.
2. Seller stuff could change. We made some minor requests and largely got them.
Reasoning:
We were spending 6 figures. The quality of my work would have a major impact on my family for a long time to come. I was newly married and this was my first family related big project. I was damn sure going to understand how interest rates and loans work ("whats a point?", "fixed vs float") and what legal junk we might be getting into.
I got a chance to learn a little about real estate. When life throws you a stack of legal documents, make lemonade.
I also got to vet out the agent. I work hard and have had some business success. I figured one day it would be time for another house and it would be nice to have a long term relationship with a trusted realtor on that one too.
Core point: it is your name on the document, it is a lot of money, it impacts your feature. Exactly how lazy are you to not read it?
I wouldn't consider anyone lazy for hiring an attorney to read the fine print and summarize it, rather than reading every word. It's not a matter of laziness, it's a matter of actually protecting yourself. It doesn't hurt anything to read the documents, but it's not a substitute for actual legal counsel.
I also would not trust my real estate agent explaining the contract to me. Just like you should never go with your real estate agent recommended house inspector. Your real estate agent may be the nicest person on earth, but they have a vested interest in the deal going through. It's prudent to find your own attorney and housing inspector who are not associated with each other.
Nobody really tells you these things unfortunately and it is scary as hell making that first house purchase!
In these cases you really do need a lawyer who you trust has read the documents and is protecting you.