Certainly keep it. I have 4 lathes - they all get used. I “need” just one more! While that might be weird, it is not at all unusual for home machining folks. Every lathe is a little bit different - so is preferred for different operations, or you have one set up for some task, one breaks down (and other valid reasons above). People talk about the ultimate do everything lathe - I don’t believe it exists. With multiple similar machines, it covers more bases (even if it is just for convenience). Having a 10” & 14” makes a great paring. Unless you are absolutely out of space, you definitely should fix up and keep both lathes.