In latest bioses for Asus boards (18.104.22.168B on X570 boards) CPPC switch is present at last, Cool&Quiet is there also (under different name) but PPC Adjustment is not there still. I guess it will trickle down to X370 too in a few days.
According to 1usmus it is not really needed.
Anyway boosting behavior on 22.214.171.124 is broken again anyway - I can't get 3900X to boost above 4.5Ghz at all regardless of whether PBO is disabled or enabled, even on a clean system without any apps that would impact XFR algorithm.
At least per CCX overclocking is present so I got CCX0 to 4.6Ghz, CCX1 to 4.5Ghz and CCX2-3 to 4.4Ghz (bye bye Ryzen Master and setting clocks on every boot and standby). Voltage is FIT compatible at 1.47V. With good cooling (in games only, no rendering and no Prime95 AVX2 at all) I have a perfectly stable CPU with temps below 80C. I only wish they would include "per CCX" voltage regulation, but beggars can't be choosers I guess...