Gaston:
Aren't Porcupine Tree a 1990s-2000s band? And what about Spock's Beard and all the other modern prog bands you seem to be overlooking?
Marillion are definitely prog - and still going strong - and much of the Fish-era material is highly political, touching on the troubles in Northern Ireland, the record industry, and social politics.
Forgotten Sons:
You're just another coffin on its way down the emerald aisle
When your children's stony glances mourn
Your death in a terrorist's smile
The bomber's arm placing fiery gifts on the supermarket shelves
Alley sings with shrapnel detonate a temporary hell
Radiohead are much less political than Marillion - and "Karma Police" has incredible lyrics, not to mention the wonderful coda;
Karma police
arrest this man,
he talks in maths,
he buzzes like a fridge,
he's like a detuned radio.
Karma police
arrest this girl,
her Hitler hairdo
is making me feel ill
and we have crashed her party.
Finally, "Paranoid Android" is over 7 minutes long - longer than, for example "Garden Party". "Supper's Ready" is in fact 5 pieces, each around the 3-4 minute-mark. 2 of those 5 pieces are repeated, and thematic material is used from the 1st to give continuity.