You are entititled to your opinion, but it isnt the same as mine!
Polybushes work pretty well for me, I have fitted several sets, current ones working well since 2008!
My mate drove all the way to Cape Town in a polybushed series, the bushes were about the only bit he didnt have issues with!
Polybush kits were available from the 1970s as an upgrade for Saabs that were used in unusually rough conditions!
Saab thing was possible to make for easier repair in rough conditions rather than an up grade. Poly bushes are not as durable as metalastics but can be changed quicker.