I think with brandywine it's because both it's a popular type, and there are multiple variations. With something like Potato Leaf/Regular Leaf - PL/RL you might be discussing a whole list of tomatoes, and have to type the long way dozens of times in a post of the list. Also, there's the spelling to consider, you can probably figure it out if you need to type it out, but you might have to stop typing and think about it.
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