That's not really a difference - inkjet printers print the same way. In that case it's just happening at a level a little beyond the user's awareness, and to a smaller dot size.
Yes, you are technically correct...but, the point is, that an inexperienced printer should know and understand how dithering and halftone dots work. When screen printing a "picture" or photo, calculating the correct dot size and frequency in relation to the screen mesh, will be a factor effecting the quality of the print. When outputting the film, the operator makes those choices. The default settings will almost certainly not work.
Also to take your point further, whether you use a laser printer or ink jet, the halftone dots and dither dots are made up of thousands of micro dots. But, those individual micro dots alone would not likely be adequate on a film to burn an image on a screen printing screen. You may be able to print with the screen, but the results would not be as close to the original image as it could be with dithering or halftone dots.
Thank you for the clarification.
Mike