Runbox 6 has text for everything, whereas much of Runbox 7 is communicated via icons, requiring a mouseover to discover the function if it’s not abundantly clear. (one could make the argument that the Trash icon somewhat also resembles a clipboard, for example.) Icons and their function can be even more difficult to interpret for those with low vision – for example, the elderly. Some text mixed in can go a long way to fix this.
I would love to see a mix of both approaches, or at least, the option for it. I do understand that many may prefer the existing layout, and they should be allowed to keep it if it works for them. I’m not a fan of the text-heavy approach of Runbox 6, either, but Runbox 7 can be made a lot friendlier with some text in the right places.