This needs looking at from a long way off.

Human beings need a wide variety of abilities to survive as a species. Humanity has needed all sorts of different skills over the 100,000 years it has taken us to get where we are today: different ways of thinking, different ways of seeing the world. A bit like the range of different personalities we encounter every day. Some people's personalities are suited to one situation, where other personalities suit something quite different. Humanity has needed them all at various times, whether it is in raising children, finding and keeping food, or defending a family against predators.

It is the same with thinking. The absent minded professor is useless if you want to organise a party, just as the party girl or boy has little inclination to explore astro-physics! Yet we need them all.

Dyslexia, dyspraxia, dyscalculia and so on, are ways of describing how someone thinks. Each of them has particular patterns of strengths and weaknesses. They are the kind of 'conditions' that have come to be labelled a 'problem'. This is because the 'dys' ways of thinking do not fit in so easily with the highly organised world of modern education, not because there is anything inherently wrong with these ways of thinking. People who work in education are increasingly calling these differences neuro diversity in order that we think less negatively about them.

At the moment mechanical thinking suits the systematic way that work and education are nowadays organised.Other ways of thinking can therefore be seen as 'a problem'.

The situation has become more difficult for non-mechanical thinkers, because this mechanical system runs on measurement. Everything has to be measured (tests, exams, reports, etc.) before it can be said to have any value. Forms of measurement have to be quick, easy, cheap and inflexible. This has resulted in an exam based system which disadvantages those people who do not have thinking strengths in fast reading, writing and organising concepts in a mechanical way.

So, no more 'dys' anything. Our species has survived on a diversity of brain patterns (neuro-diversity). Our culture is choosy about which ones it takes seriously. In the Middle Ages there were no clocks, and very few people could write. Nobody had dyslexia! We have always been neurally diverse.