Yes, unfortunately the "system" assumes that anyone wanting a C1 will be a professional goods driver, so even the theory part of the test involves knowledge of drivers' hours rules, tachographs etc.
Whereas us "oldies," with our Grandfather Rights, can drive up to 7.5 tonnes without any of that!
Ideally, there should be a separate test available for people who will only use a C1 for "social domestic and pleasure," with none of the commercial stuff, but I fear it won't be a Government priority anytime soon.