Think of cooking -- if you're doing an existing recipe from memory, that's more Si based. But if you're trying something new and it's not quite working, then it's more Se when tasting. But if you want to fix what you've done, you might have to brainstorm with Ni to think of all the spices or ingredients you have and which ones might give the desired effect. You may have to completely alter the dish you're cooking You can't experience the new result and you can't rely on memory, you have to project.
One thing that I agree with you on ... I don't think everyone of a certain type uses the same processes in the same order and same way. There's a feeling that the processes are deterministic based on type, but some of that might be confirmation bias. I relate to your confusion with Ni as I have some of the same problems with Ne (not understanding it, not thinking I'm using it).
Oh ... the source for that data was an old car magazine where they talked about personality and vehicle choice. I have no idea where that magazine is or if I still have it. So unattributed source is unattributed. But it's in line with my own experiences.