Most projects (given our definition of “more than one step”) don’t need much of any support material, and if they do, one or two pages of notes and bullet points is usually sufficient. If you have lots of detailed project plans and other support materials, it would just make more sense to keep all that in digital or paper folders.

If by “maintaining” the lists you mean, “write action reminders down in a retrievable place that you’ll look at when you need to,” then it’s not going to take you nearly as much time, effort, and stress as filing it in your head, constantly feeling pressured about what’s in there, and having the thought occur again (and again, and again) in your mind because it doesn’t trust your system.