Originally Posted by
chaadster
Whether you pressfit cups into the frame or thread them in, the bearings are always pressfit. If it’s good for the goose, it’s good for the gander… Any issues are to do with design and manufacturing, not with the nature of pressfit. Threaded BB inserts can just as easily be misaligned in carbon fiber monocoque if the design (engineering) isn’t good.
This is meaningless. It's way, way easier to get the tolerances on a machined plastic or meta part right than a molded carbon shell. Yes, press fit is not inherently a problem. But pretty much 0 bike manufacturers are capable of consistently nailing press-fit bottom bracket tolerances. The best PF BB shells are machined alloy. This is what Look does.
so when someone says "press fit bad", they're obviously not saying that the entire concept of press fit is bad. They're saying that much of the time, the manufacturer is going to screw it up and you're going to need help. And that comes from an adapter of some sort.