It it weren't for 'autofocus' and LED screen magnification, my photography hobby/career would be in real trouble. I'm not blind, but I have visual impairment due to macular degeneration and viewing things through a view finder or telescope is challenging. Now, thanks to iPhone polar alignment with PhotoPills, I can actually do some astrophotography of the Milky Way. Using the bracket to attach my iPhone to the MoveShootMove rotator, I can polar align on the phone screen, even if I can't see Polaris due to clouds, trees, houses, mountains, or bad eyes.
On three different attempts I've been able to get good enough polar alignment to shoot using a 20mm lens with exposures of 1-2 minutes to get nice pinpoint stars. I have not tried longer lenses yet or longer exposure times, so I can't speak to ultimate limitations, but for me, it's been wonderful.
I actually bought the polarscope and laser pointer along with the iPhone bracket so I have all the options, but it's possible I'll never even bother with those other two methods, at least not for Milky Way and big sky photography.