My base line is using Alt Txt. Every image should have it. An image is not a complete without it.
It took a while to develop the habit of not forgetting to add it, but now it is second nature.
I don't need to use a screen reader but I like reading Alt Txt others have added to their images on the socials. (Incidentally, Xwitter and Insta were notoriously bad for Alt Txt, but the Mastodaoine the fediverse are good at it, very few images don't have their wee ALT tag in the corner).
Happy GAAD everyone, Mags