On the other hand, a test with questions like 'are you a tech worker' might be a lot shorter and just as meaningful!
The test doesn't sort evenly. One of the most popular online test sites says in one of their descriptions - I forget which one - that "this is the rarest type with only x% of the population."
I had a female friend who was an INTJ, and told me that it was very rare among women. Being very, INTJ, she was referencing some rigorous statistics.
There are 16 categories, which means you'd expect about 6% in each if the test sorts evenly. It doesn't; in fact only between 2% and 3% of the population is INTJ. Unless one of the questions is literally "are you a tech worker", that's very conspicuous selectivity.