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DT - false ideas of 'equality' are the enemy of real equality. The only equality that really counts is equality of opportunity and you do not get that through uniform mediocrity and catering for the lowest common denominator.
Where would we be now if, in the interests equality, there were no special training facilities for the 'elite' Olympic athletes for instance? Are they not subject to selection by ability? of course they are and appropriate facilities are made available. (Thanks largely to John Major and lottery funding)
There is nothing wrong with looking at aptitude and making appropriate provision for that and this means selection, the academics go in one direction and others in another. What would be wrong though is to close down a particular route in case there are late developers who change direction.
A great deal of ill-informed criticism is directed to the old pre-comprehensive school selective system in which I was educated. This talks about pupils who did not pass the 11plus being 'dumped' into non-academic schools, discarded and labelled. That is nothing to do with reality but everything to do with the snobbery of a certain type of person who is obsessed with academic achievement over all else combined with political dogma.
I was in the first generation in Dover that did not have to sit the 11 plus and we had to pick a school (though there was 'guidance' for those without Grammar ability). Transfers to and from the Grammars were also quite common. No-one was labelled, discarded, dumped or whatever emotive words the anti-selection brigade want to use. A levels were available at the Sec Moderns as well as the Grammars and Uni entry was also available. None of that was new for the 'non 11 plus' generation, it was the same for those older than me who sat the 11 plus. In many ways I wished I had sat the exam just to prove I could pass.
It is this obsession with a particular brand of 'equality' that creates inequality and reduces social mobility.
I went to Astor Sec, left school at 15, never went to Uni, never sat CSE's, O levels or A levels. Have I 'suffered' as a result, do I feel in any way inferior to Uni graduates of my generation? - no, not at all. Social mobility a problem? No, not for me and it need not be a problem for anyone who is not taken in by the sob stories and excuses some make for their failure.