Wanted to note that the pattern of starting and never finishing projects maybe fits the CDC symptoms around difficulty directing one's attention. Potentially then a lack of motivation to start new projects could be a common experience of people with undiagnosed ADHD later in life, but it is perhaps less common for those without the accumulated guilt of past experiences (speaking hypothetically and without expertise).
I empathize with how the complexity of these experiences and their knock-on effects make understanding what is happening with ourselves difficult.
It's just more commonly used in literary writing than in technical writing.