Well yeah, why would they offer an legal guarantee if they don't have to? They could have a watertight proof that their software works perfectly in all situatio

Well yeah, why would they offer an legal guarantee if they don't have to? They could have a watertight proof that their software works perfectly in all situations (lol) but the lawyers still would prefer to disclaim as much liability as possible. And even if they did, all the test guarantee is that the tests pass, of course the main limit is that they don't actually test even a small fraction of what the customers actually want to do.