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Why are members trained in a large number of subjects and disciplines? Why not just focus on a particular field from the beginning?
General education, in many countries, segregates every subject teaching it in isolation of its peers. As a community of reason we should realize that no subject is used in complete isolation from the others, especially in the sciences, many different disciplines combine to form very diverse subjects from nano-technology to bio-chem. But equally art, philosophy and creative visual thinking have been behind some of the greatest scientific breakthroughs (DNA, General Relativity etc) in a holistic, homogeneous approach to education a general spread of foundation skills can greatly improve our abilities in unexpected ways.
Secondly, the general studying of a wide range of subjects allows us to create a basic level of equal understanding. This could point to a level whereupon the member becomes a full fledged member of the community. The idea is that the level should not be a destructive barrier for people who have very specialised expertise but a level where by the members have enough understanding that they can be helpful in any disciple in some way, even if it is just data entry or testing data, at the very least community members should understand the arguments and essentials of a dialogue in a number of different fields.
While equality is the goal there might necessarily be a hierarchy of upper and lower levels of understanding. The lower level being equivalent to a GCSE or O-Level and the upper being the same as an A-level. To become a specialist in any subject you must have a fundamental understanding of the whole (chemistry, biology, physics, mathematics) in addition to this the disciplines of electronics and computing should be taken as they are essential for building practical applications or appliances. Nevertheless, it would be unreasonable to assume that you need a high level of knowledge in all areas of all subjects there has to be some cut-off points. To become an expert in a field you need to direct your unwavering attention to it, thus an advocate of a subject will have to be content in letting other disciplines slide.
Finally, by keeping members educated or teaching subjects in a churn it keeps knowledge and humility alive as they realise their weaknesses in other disciplines and the strength of their peers, meanwhile by teaching other students their subjects it helps reaffirm and retain those fundamental skills of their trade.