The Create Fishnet geoprocessing tool is great for producing grid feature classes. One thing I find that it lacks is a resolution parameter. With this parameter there will be intermediate vertices added to the polyline or polygon so that it doesn't look so blocky when a projected spatial reference is used for the map.
As an example I have created a 10 degree x 10 degree grid for North America and then changed the map spatial reference to North Polar Stereographic. Because the grid doesn't have any intermediate vertices the feature class appears blocky. Using a resolution of say 0.1 degrees would introduce vertices within each feature so as to make it smoother.
I think the logic to do this already exists in the Layout Grid function. If I go to my Layout and add a Grid and color it red you can see the difference.
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