For the development stage it would be fantastic to have a "wireframe" HELIX Ultimate Template and/or SP Page templates. (no colors, no border-radius, no effects, all in one font asf.)
This would allow us to build pages with actual content with a neutral design and show a client what elements we (can) use for displaying content (akkordeons, sliders, asf.) This way, one could already work on the actual website insted of using a wireframe tool and then rebuild everything in PageBuilder.