Consumer Tests
I have noticed through the years that each testing institution has its priorities. A classic case in point here in Germany:
Up 'till the late 1980's we had "Stiftung Warentest" and Ökotest. SW was (and is) known for their carefully documented tests and their willingness to go to court when a manufacturer screams "foul".
They do, however, tend to downrate the overall value of an appliance if certain aspects are not in line with their opinion of what is right. The instruction manual includes seveal European languages? Lower the rating. The packaging material is not recyclable? Lower the rating. Still and all, I find them a fair guide to general levels of quality - and an invaluable resource when I look at a product made by a company (Candy/Indesit for instance) which I would normally avoid.
Ökotest for years and years rated everything which used electricity (worse, batteries) or made life more pleasant through throw away products (plastic bag sealers, for instance)very very poorly. Faced with losing their last subscri bers (even for German standards, they were "Bedenkenträger" - nay sayers) they asked their readers how they wanted the ratings done. The readers responded that they should clearly separate between quality, suitability to purpose, etc. and the environment.
So today, you can find a washer rated "very good" by SW and "extremly, absolutely terrible" by Ökotest - but when you look at the categories they come out to be very close on the relevant features and usefulness.
Who knows why the Swedish testing institution prefers plastic? I bet they do have a reason, and if you wrote to them I would be interested to know what they said.