In version 2.2, this worked correctly.
For example, setting to a .014mm gap yields the result in the first picture below.
Setting to 1mm gap yields the result in the 2nd picture below.
This is exactly what I would expect. I have control over what the machine is doing. I can also easily see the result of changing a value in the user interface and validate that the control is changing the parameter I want to change. And as odd as it may seem, I may actually want this if I am doing something creative with multiple processes and overlapping models.
I don't see any downside at all to making it work like it used to. In fact the way it is now, I don't think there is good control between 1st layer after separation and the layer after that. The way it worked prior to 3.0, the 2nd layer after separation would have a fixed relationship with the 1st layer after separation.
Sure, I can goof up and set the gap too large, but that's my fault. I want the control.
I'm at a loss as to how changing how this is represented in the preview will have an effect on the printed model. The v2,x preview showed the second and subsequent layers printing above where the first layer was printed....showing the model "levitating" above the raft. This graphical representation looks as if has been changed in v3 to show the first layer printed at the elevated height and then the second and subsequent layers being printed at approximately the height where they actually is printed in real life. The effect looks equally strange. The model no longer "hovers", but looks as its been mis-drawn. Both can be said to be either right or wrong....but how can this be correctly represented to satisfy everyone??
Surely the real issue is the first layer of the model is for some reason sticking too hard to the raft after being printed in fresh air and dropping under the effect of gravity. To me, this is probably caused by other factors...and not how high the layer is printed! Or how it is represented in the preview!