This is something I've noticed in the several times I've started over on a project because I didn't like the code.
When someone first starts writing code for a new program, they're generally very excited about it and can write a lot of code in a short amount of time. If they run into a problem, they're determined enough to keep trying to fix it until they succeed. Naturally, as the project gets larger, it becomes harder to code as finding the cause of bugs becomes more time-consuming. As the rate of increase of both code length and functionality decreases, the amount of excitement about the project also goes down a lot, causing the project to advance even slower. It's really pretty depressing. I've gotten stuck for a long time on fairly small problems just because I didn't want to spend the time to fix them. Sometimes the momentum of completely rewriting the program (up to a few thousand lines) can get you further ahead in a few days than you would get by continuing to work on the code you stopped liking a while ago.
Writing really good code in the first place is a much better alternative.

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