The Legacy themes are ones without Mobile versions, and are designs that are, how should I say, 'less than contemporary', so we will unlikely be moving these forward, adding mobile variants or other updates. But many people use, and like these designs, so instead of removing them completely we just put them in a 'legacy' folder.

The other 'General themes' were more favoured designs by our graphics designers, and will at some point get mobile variants as well. The 'General - Mobile ready' themes are ones that have one or more variants included and so are better suited for mobile optimized and desktop websites.