This is my Pre-50 crafting policy. I can HQ 3 levels above my own level with all HQ gear and mats. The only cross class I 'need' is careful synth and that can be worked around with food. Once you hit 50 and demimateria and other absolute NQ mats are inserted it collapses so you are wise to find an RnG rotation you can make work because it becomes required after a point.