Not true at all for RK3588 and are you really sure about RK3588s? RK356x/RK3588(s) all feature the same NaNeng Combo PIPE PHYs multiplexing this and that and with RK3568 it’s already known to work to use SATA via the USB-A ports without an USB-to-SATA bridge but just a simple breakout cable (violating USB specs ofc) and a device-tree overlay.