5 years isn't that long. I've been doing 3X that and I'm constantly learning new things. Not even about new language features but even languages I've been using that whole time. New ways to problem solve. New algorithms. New tools.
Not finishing things can be okay but also not. An important skill to learn is what's good enough. And to write good enough to be easily upgradable. It's important to write code to be flexible for this reason. It's also important to realize it's okay to completely throw away code. But also this is the reason comments are so important. Don't just write what functions do but also write how you envision the design. Even if you can't get to it now. Then when you or anyone else comes back (after lunch, next week, next year, whenever) there's good hints about all that. Knowing how to get up to speed and be effective fast. If anything this helps agents even more. Commenting is a vastly under appreciated skill and only becoming more valuable
Not finishing things can be okay but also not. An important skill to learn is what's good enough. And to write good enough to be easily upgradable. It's important to write code to be flexible for this reason. It's also important to realize it's okay to completely throw away code. But also this is the reason comments are so important. Don't just write what functions do but also write how you envision the design. Even if you can't get to it now. Then when you or anyone else comes back (after lunch, next week, next year, whenever) there's good hints about all that. Knowing how to get up to speed and be effective fast. If anything this helps agents even more. Commenting is a vastly under appreciated skill and only becoming more valuable