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[Rippthrough]

Fair enough, so much easier with independent suspension though.
mk4 golfs/a3's have a rear beam and they outlive the car.

The Golf is a beam, that's why. Not independent
The 306 is independent, so I'm not sure why you think it's easier with independent...

And that Golf is going to bend the upright the first time any serious force goes through it. Not to mention fail the MOT.

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Dude that explanation totally made me go crossed eyed, and i'm not entirely convinced you're right... Passive rear wheel steering is just that - passive rear steering - ie not oversteer... Lowering doesn't stop or reduce weight transfer (i don't think..? Ripp?), it just stops the suspension reacting as much by reducing the travel. Really low cars suffer badly because there's not enough suspension travel to keep the contact patch up, so it takes less to unsettle the car. Higher spring rates on the rear, or softer on the front, also make it worse, as do similar changes to the arb. Another factor is that most people buy poorly specced springs and dampers on the cheap to do the lowering, which again reduces the effectiveness of the suspension as a whole.

Lowering does reduce the weight transfer as the CoG drops.
However, the passive rear steering is done on the rubber beam bushes, so how much rear steering you get is pretty much directly related to how fooked the rear bushes are and how hard you're cornering.

There's the other issue with lowering the rear though in that most people don't stiffen the rear springs and dampers to compensate for the reduced travel, hit the bumpstops mid-corner and the suspension acts like a pogo stick from then on because the damper cannot control the sudden jump in spring rate = snap oversteer.
You've only got to watch a rally crash compilation on youtube to see how many 205's/106's and 306's do this when they've got the ride height wrong and it sends them into a tree.