Uninformed suggests buying without proper research.
And while there are people that buy premade PCs without proper research, there are also plenty of people that buy PC parts to build a PC without proper research.
On the spec front, some PC builder motherboards show higher specs that they really support (per buyer comments- max memory speed supported is common complaint).
I have never had a spec on my premade PCs be wrong.
But forget logic.. let's try and sound very knowledgeable by making a crass generalization like "all budget premade system buyers are uninformed and being taken advantage of."
But I will admit this topic of ram speed did make me check mine. 1066... dang.