Measuring the elevation along a transect is a bit like measuring the length of a coastline. If you change the resolution, you change the final result, but none of the result is relevant if you don't mention the scale of the measurement. If you look at a portion of soil with a binocular, every grain of sand will be a cliff. If you fly high on a plane, only ...
You left z-factor = 1.
The ArcGIS Pro Help for Hillshade specifically states:
If the input raster is in a spherical coordinate system, such as
decimal degrees, the resulting hillshade may look peculiar. This is
due to the difference in measure between the horizontal ground units
and the elevation z units. Since the length of a degree of longitude