You would be right if the 23andme tests were accurate, but they really aren't. They only test for the most common mutations for certain genes so they don't replace going to see a clinical geneticist. Also, the vast majority of conditions you could have aren't even tested for at all. A lot of these are the kinds of things where there is only a 1 in 40,000 chance of you having it, but there are so many of them that your chances of having one of those conditions is actually pretty high. But yeah, doctors are terrible at diagnosing chronic illnesses so you really want to figure out what you have on your own and then just go to someone to order the tests for you. But 23andme wouldn't be useful for this unless you get really 'lucky' and have one of the 200 or so things they test for.