Standard T&Cs
The sensible option would be to have a published standard set of conditions that we can all be familiar with and therefore should be easy to explain and accept.
OK, so each business is going to argue their own unique nuance, but really, are any of them all that different.
It's been done in Scotland. When you buy a property each sides solicitor/lawyer would draw up their version of the contract. Much back and forth would take place until agreement was reached. To simplify the process a Scottish Stand Clauses was approved by the Law Society.
Perhaps this is something Which? or similar could champion (in the UK)