I think most people in this forum knows the vague online tests are crap. v,v I am actually not in favor of the test so much, but rather the concepts..
I've never heard of Jung himself proposing a "test" to find out one's type. He was a psychologist and would himself psychoanalyse his patients to figure out their psyche. I think he knew better than to believe that giving his patients a vague questionaire to answer could spit out the right type. A psychologist's job often includes knowing things about your patients that they don't even know about themselves.
Jung also didn't make standard "profile-descriptions" for each type, instead his focus was on explaining the cognitive functions in detail and elaborating on how/why those functions can lead to certain behaviors. Simply skipping right to the behaviors and creating profiles based on generalities will naturally make it so that loads of people don't fall here or there.
It was Myers-Briggs who came up with the test in order to make Jung's work "useful" in the work field (in other words, condensing all of Jung's work, leaving out tons of crucial information, in order to present it in a way that looks appealing at-a-glance to those who are not deeply inclined to explore topics at the level they should). Not everyone wants to read an entire book, or go searching for an expert, just to find out their type - so the MBTI is a quicky/condensed approach ( fast survey + uber-generalized descriptions of type = profit!). But to invalidate the actual concepts that the quicky are based on simply because the quicky is lacking is robbing yourself of so much.
Jung's book was written in 1921, so yea, close to 100 years.

The advancements made since then have a lot of controversy and different psychologist have proposed different variations of Jung's work, ultimately causing a bunch of confusion. But yea, you're right - no real major breakthroughs have been made since Jung..
You should just be who you are and fuck the test. Is it really possible to limit all of humanity into sixteen different personality types?
I like your style, but as much as I'm for freedom, I think it's impossible to escape your own psyche, or biology in general. I can't will wings to grown on my back
(I really wish I could.. =/ ) , I can't change gender at will, or change my eye color, and likewise cannot change the way my mind is hardwired (however that may be). All I can do is learn to use the body I have to it's fullest potential~