No light preview, no prefab leveling, no layering, no animation preview, no alt drag, no Rot-z bind, no hide unselected, the Maya style free rotation gizmo is only in 1.5.0, glitchy floating windows mode for trying to design on multiple screens, no path spline preview, limited texture browsing convenience(there is none), no auto-caulk feature for bad faces, no terrain meshes, glitchy selection on complex or thickened patches, no control+alt+rclick or cntrl+alt+middlemouse for easy entity clone, no drop entities to floor, no drop vertices to surface, glitchy save as prefab, retarded counter-productive camera scheme for navigation.