Didn't read the site or do the test, but thoughts on multitasking in general ...
You're correct that Ne types do need a level of distraction depending on where it is in the stack. However it is true that for all people actual task shifting does require a cognitive shift, including Ne types*. Whether this shift is a positive or negative for Ne types - in my experience - depends on the nature of it.
I've discovered the following guidelines for myself
- Generally about 4 hours (2-6 range) is maximum I can spend on a focused activity (e.g. a software project). This is collaborated by Drenth and other Ne dominant writers (e.g. William James)**
- This can be increased and extended by adding in distraction to the mix. For me it's simple; I listen to music. I have some fancy electrostatic headphone systems and listen to classical music while I work. Really helps keep me focused.
- Changing venue is important. I like having the day job as I can go into work and get a change in environment. I may be doing the same thing (programming, thinking, exploring, ideating ...) but it's a different project, different place.
- Taking short diversion breaks (something like a few times an hour - 5 minutes?) is good.
- If I get really wedged a complete shift seems to be necessary
So I'll work for 4 hours in the morning on my projects, 8 hours at work on those projects, come home/exercise/family/movie/whatever, then in the evening spend another hour or two on theory work. All told some 12-13 hours/day, every day pretty much. The weekend is a different mix. Been doing this for years so it does work.
Being clear on the mix of activities you do also is helpful. For me it's computers and music, both listening and playing, both which I do nearly every day.
* Read Deep Work
by Cal Newport for information on this
** Work that I don't enjoy - say outside physical work or cleaning, I can comfortably do about an hour, three maximum