Shifters, bars, stem and saddle should all be parallel to the same plane, if the frame has traditional geometry then it should be the top tube, if it is a TCR, then throw it in the bin and start from scratch.
Oh do go on - please post a picture of your perfectly proportioned and positioned bicycle, along with a thorough summary of why your bicycle should be seen as better and also a prefix of why a TCR should be thrown in the bin!
Shifters, bars, stem and saddle should all be parallel to the same plane, if the frame has traditional geometry then it should be the top tube, if it is a TCR, then throw it in the bin and start from scratch.