Running an online retail shop.
Should I bother going through and fill in the Alt Text for all of my product images?
I’ve got dozens of pics for a lot of my products, including various colors.
Right now I’m labeling the item, the angle the view is from, and the color of this fashion product.
Will this increase my visibility in Amazon’s organic search results?
It might or might not help with SEO, but it certainly won’t hurt, and it can have other benefits (making your site more handicap-accessible, for instance).
This. I suspect accessibility is a lot more important than SEO readiness here. I know that in Ontario, we are required to do things like subtitle videos for accessibility–that was part of my just-concluded part-time job–so providing proper alt-text, or explicitly defining its absence, is probably important.