I'm pretty sure we won't see any rooting / bootloader unlock on Vivo X90 anytime. Internationally the X90 and X90 pro will not sell at all, due to being overpriced like crazy. And in China other phones seem to be selling much better too. The x90 pro+ will be rather exotic - Vivo mainly sells cheap stuff in China. Samsung, Apple, Oppo and Xiaomi are the main brands for flagships in China.