Thing is, people who say that stuff don't even look at the rest of the chart. Venus and Mars especially, when it comes to relationships. The sun is just one thing of many. Just looking at the sun and ignoring the rest is like going to the Louvre and looking at one famous painting, then leaving. Or only reading the description on the back of a book cover without even opening the text. Drives me nuts.

Plus, there is also the decision of either leaving to find someone more compatible that would be an easier relationship, but also one with perhaps less growth, or staying in a more challenging relationship but choosing to grow together and being aware of some differences (of course, some differences aren't negotiable) and willing to work through them.