I'm pleased to report that the courts
don't agree here in Australia. I was taught this story at university - apologies in advance if I've butchered some of the details.
As I remember it, there was a famous case decades ago where a bank manager visited the home of an elderly Polish couple. The couple had a mortgage with the bank, and the bank wanted to renegotiate the terms of their mortgage. Only the wife was home, and she barely spoke any English. She understood that the man in the suit from the bank wanted them to sign some paperwork, so she did. As a co-signatory of the mortgage, her signature was enough.
The couple eventually lost their home as a result, and the case went through the courts. Eventually the high court (equivalent of the supreme court in the USA) sided with the couple. They said that because the bank has more money and skill, they have more power in a negotiation like this. As a result, they bear proportionately more responsibility during contract negotiations. In this case, it was their responsibility as the powerful party to make sure the borrowers actually understood the terms they were signing.
We basically only have 6 banks in Australia because of things like this. Its very difficult and expensive to open a new bank in australia because of regulatory requirements. But my impression is that the banks here are extremely careful when it comes to interacting with unsophisticated investors. They (reasonably) assume the courts will rule against them if they do anything that doesn't pass the pub test.
(I am not a lawyer, this is not legal advice, etc.)