Humanity has survived and grown due to practical learning.
While learning for the sake of learning may be preferable for you, there is the issue of society in general that has to be dealt with. A society of NTs would completely self-destruct within weeks, as there would be no one who would just do things without either trying to completely rework it, or vehement objection. The social tension would become completely untenable.
Face it, we need sensors, because we need people who will unquestioningly do things when the situation demands it. Likewise, we need education for them because they need the tools to be able to do these things for society. The problem of education is that the system (speaking from an American, trackless perspective) is designed to give these tools, and not much else, with the expectation that intuitives will learn what they want to on their own, and find their niche in college or university (which they often do). While it is effective as an overall system, it brings no lack of annoyance or consternation on the part of the intuitives who are being shoved into a completely incompatible system (never mind reinforcing class privilege as wealthier intuitives can go to private schools more inclined to their thinking style).
What you seem to assert as the failings of sensors is a difference of need. The lack of self-reflection doesn't come from a deficiency - it comes from a lack of needing this sort of thinking to reconcile oneself with the world. This isn't always a bad thing, either. If it's harvest time and several acres of crops need to be reaped, is it very useful to ruminate on the two or three plants that you accidentally destroyed? And yet, it's because of the lack of "thinking" of this "stupid" sensor that the rest of us have food on our plates. I mean, it's no exaggeration to say that garbage men and sewer pipe maintenance crews are by far the most vital positions in urban society, only outweighed by food production on a national level. What makes us intuitives somehow "better" than them, when we couldn't live without them?
And what you seem to perceive as a "mindless" society is no different than it has ever been. Prolefeed is prolefeed, and it's been around since civilization has ever existed - the US national anthem was originally a drinking song. Horatio Alger books were complete mindless drivel. Gregorian chants had no thought to them whatsoever, and the rest of popular music in that period either was about how great the rural folk are, harvesting, prostitutes or alcohol. The number of trash novels in the Victorian age was legendary. Even Shakespeare wrote to entertain the masses, and not to be parsed word-by-word 400 years later, it was just that he was particularly good at entertaining the masses, and he wouldn't have hardly added any words to the English lexicon if he appealed to the upper classes; they would deride the novel words as ignorant and debased.
So, in closing - get over yourself.