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A great advantage of using the thumbnail's alt attribute for caption text, is that this is indexed by the search engines and associated with the image.
The problem with using named images across variants is that Xara only generates one image whereas if you let Xara generate a numbered image it creates two separate images, one for the desktop & one for the mobile. You could work around it by using two image sets instead of one, so for example if you have an image named "myimage1desktop" you could make a copy and name this "myimage1mobile" and use them in the different variants. You could then give them filename=whatever etc. However this is a lot of additional work :(