It seems that the operator is expected to sometimes make very small adjustments to the throttle level, going by what looks like clickable arrows. I wonder why t

It seems that the operator is expected to sometimes make very small adjustments to the throttle level, going by what looks like clickable arrows. I wonder why they didn't locate the UI elements corresponding to throttle indicators butting right up against each other, with a Vernier scale on them, to make misalignments quantifiable and more obvious. Not that it would have helped in this case, but maybe the scale can be magnified and change colour when there is misalignment, which would have been possibly slightly more obvious? I don't know.