I had a similar feeling when I finished my freelance projects, that I would be difficult to replace, or that it would be easier to start from scratch than to tr

I had a similar feeling when I finished my freelance projects, that I would be difficult to replace, or that it would be easier to start from scratch than to try and decipher the system. That's partly because I was being "too creative" — I love making things from scratch, but that's suboptimal from a business perspective fot several reasons. And partly because I didn't document the decisions very well (except in random comments). So I had the feeling like most of the value was in my head, and a lot of work would have to be repeated with the next guy. Aside from just inexperience and lack of professionalism on my part, there seems to be some tension here between what's good / enjoyable for me as a developer (making everything myself) vs what's good for the business (probably WordPress / PHP).