Straight 1⅛" steering tube is not actually straight?
Yes this is totally normal. The crown race is fitted to the base of the fork steerer with an interference fit. If the steerer didn't have a slight lip at the base, the interference fit would be all the way down the tube!
The reason it is called a straight steerer is because it has the same size bearings top and bottom. Tapered meanwhile means having larger bearings (like 1.5&quot;) at the crown race than at the top race. Much more noticeable.
I don't think the diameter of the crown race seat is totally universal, I've had to file one down before at least. So that is a good example of where the EC 44/30 SHIS code you notice is so useful in getting this kind of thing right.