Brian,
It's there. Some are better than others. I'm sure I dont see nearly as many as you do, and I''ve yet to find one with zero taper. Factory spec is zero to .0005. Last MP I had the worst journal was .0003 taper. The last Callies was zero by my mic. The Eagle downstairs now has one journal at .0005. The cast eagle it replaced had two journals with .005. You know those are not fatal, but there are those biulders for whom perfect is the only way. If I'm building a race engine, it's more critical. But I dont build a lot of race engines. Almost never. So I build within the factory spec. If you haven't done it have your crank guy stick an Arnold gage on one and watch it and you'll know why some people get nervous about them. They are good value and very usable out of the box, but Eagle and to a lesser extent Scat are far from pefect. There polishing step takes too much off and the journal finish suffers just like the 440Source product. At least that's what my old teacher (also my personal grinder and my favorite shop's crank grinder) says causes that particular taper issue.