Only mentioning this because the OP did - but for me (also ADHD) it's kind of the opposite. I'm finishing side projects for the first time ever because I can actually get them working before I get bored of them. My projects are more infra-leaning, and not all of them get much use, but some do. Others let me explore certain ideas and then sometimes serve as a reference point later when I run into something that reminds me of that.
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I feel the same. I not sure if I have ADHD, but I always have 2 mode of focusing on something, first one is shot burst of focus and other one is real locked in mode where I forgot to eat or drink water.
While second one is much better at delivering value it mostly activated on management/strategy games that I love :D
But with AI assisted coding now I can really work on my side project while having first focus mode. Im just writing or designing the parts I excited about, and then I let AI to handle boring task.