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Planting a fruit tree from a seed can be a bit of a gamble when it comes to the sweetness and other characteristics of the fruit. Here are a few reasons why:

1. Genetic Variation: Seeds are the result of sexual reproduction, which means they carry a mix of genetic material from both parent plants. This can lead to significant variation in the fruit's characteristics, including sweetness.
2. Hybrid Varieties: Many commercial fruit trees are hybrids, bred for specific traits. Seeds from these hybrids often don't produce true-to-type offspring, meaning the fruit may differ from the parent.
3. Environmental Factors: The sweetness of the fruit can also be influenced by growing conditions such as soil quality, water availability, and climate.

For more consistent results, many growers use grafting techniques, where a branch from a desired tree is grafted onto a rootstock. This method ensures the new tree will produce fruit with the same characteristics as the parent.