Most long contracts are a reaction to 'failure to warn' lawsuits where plaintiffs (successfully) argued that they should have been notified of something. The problem is that when you add up all those 'somethings', you get absurdly long documents.
I agree that these extensive disclaimers and contracts are not an effective way to communicate information, but dispensing with them will require either a better way to disclaim many (relatively unimportant) risks, or a change to product (and service) liability law, reducing failure-to-warn legal risk.
The only things in a contract that can be enforced must be stated plainly and clearly
Turns out there are o ly a few conditions that are actually necessary