For screen printing I am restricted to a certain number of colours. To create a gradient it would be useful to be able to use dithering to change the density of the dot matrix of a single colour.
Dithering and noise effects I general aren’t really a concept with vector graphics. You could simulate their effects to a certain degree, but unless you are viewing the image at a locked/fixed zoom, the effect will be lost at different scales.
You are better off exporting to a raster format where you can apply dithering before printing.