Is it a mistake to grow fruit trees from seeds?

Hey everyone! I live in Miami, which is perfect for growing a variety of fruits. About a year ago, I collected seeds from fruits I love to eat and have been successfully germinating and growing them. However, I've recently started to worry that all my time and effort might be wasted because I'm growing these from seeds instead of buying grafted trees. I'm currently growing lemon, orange, key lime, avocado, mangoes (two types), lychees, Spanish lime (also called mamones), and guava. Should I be concerned about any of these potentially not bearing fruit or having poor quality fruit?