I admire Robert Simpson very much, as a composer, as a writer on music, and as a BBC producer with an adventurous streak, without whom there would be no 'Brian Renaissance' and, perhaps, no 'Indian Summer' for Havergal Brian, in which he composed 20 symphonies after the age of 80.
I say 'admire' on purpose. Because I don't 'love' Simpson's symphonies. That is not a sentiment they inspire in me. They are too elemental for that. The Ninth is, indeed, awe-inspiring. There are sounds there that you won't believe are possible, really 'cosmic' (and that is no exaggeration).
On a more critical note - I have also felt sometimes, listening to his music, that there was something of the laboratory about it. Experimentation and research behind glass. The human voice isn't behind his music. And there is not much Earth. Simpson is developmental, logical, and rather angry...