Xenia, I think, like our current government, you live in a different realm to the majority of the population.
Selective schools are often NOT the best. My son's state selective only got one (tutored) child to Oxbridge, compared to 4 in the same year from a local high school (pupils had not passed the 11+). Entry to selective school is affected by tutoring (i.e. parents' wealth) and catchment area. Some of our local schools have 50%+ passing the 11+ compared to 5%- at other local schools. Guess which children live in the more prosperous areas!
It is sad that all jobs now depend on literacy skills. Even going for an interview in a shoe shop involves a rigorous interview (including role play) and filling in an application form. A job as a dustbin man requires the applicant to fill in an application form. This means that people who find writing challenging have a problem even finding the most basic jobs. However, just because they find writing difficult, does not mean that they are totally brainless. They have views; they have opinions; they have feelings.
I took a child to forest school last year. He is always going to have problems with literacy. He finds spelling and writing hard work. At forest school, he 'invented' a peg for holding up a tarpaulin, explaining to the other children how they should pull the tarpaulin and how the guy ropes should be tied. He 'created' this idea, with no input from any adults (and he'd never been camping). I know, in our twisted society, that this creative, practical individual will have problems getting a job in the future, because his literacy / maths / science (oh... the ebacc subjects) will not be up to scratch.
We are on the wrong track, and something needs to be done about it.