According to Osho, both are not inherently necessary. The one who surrenders suffices; if surrender became common, life would be effortless and the makers of conveniences—doctors, architects, moon-voyages—would lose their purpose. The non-surrenderer, chasing outer fixes, creates the very needs that sustain them. Like illness creating doctors, desire manufactures its suppliers; surrender dissolves the marketplace.
No—only surrender is needed; the unsurrendered keep inventing problems and gadgets that wouldn’t exist if we were content inside.