I'm not sure we even need Plymouth installed in initrd because the device_timeout experiment mentioned in comment #18 suggests plymouthd was starting early enough already. It's not the root filesystem that takes too long to appear, but the i915/amdgpu drivers to fully initialize. Also all this talk of SimpleDRM and initrd really belongs more in bug 1965303 and bug 1869655.
I'm not sure we even need Plymouth installed in initrd because the device_timeout experiment mentioned in comment #18 suggests plymouthd was starting early enough already. It's not the root filesystem that takes too long to appear, but the i915/amdgpu drivers to fully initialize. Also all this talk of SimpleDRM and initrd really belongs more in bug 1965303 and bug 1869655.