"Digital list managers connect only subsequent actions to projects; they skip calendar events, project plans, etc. "

This is wrong. You can easily connect those things together if you want this. Some task managers will support this with drag and drop, some will use URL schemes. Some will integrate your calendar, like Omnifocus. Or you can just use Hook and link everything together.

Part of my weekly review is making sure that each project has all its support materials, calendar items, emails and the like attached to it for easy access through the week.