  The preference of the normal neutrino mass ordering from the recent
cosmological constraint and the global fit of neutrino oscillation experiments
does not seem like a wise choice at first glance since it obscures the
neutrinoless double beta decay and hence the Majorana nature of neutrinos.
Contrary to this naive expectation, we point out that the actual situation is
the opposite. The normal neutrino mass ordering opens the possibility of
excluding the higher solar octant and simultaneously measuring the two Majorana
CP phases in future $0\nu2\beta$ experiments. Especially, the funnel region
will completely disappear if the solar mixing angle takes the higher octant.
The combined precision measurement by the JUNO and Daya Bay experiments can
significantly reduce the uncertainty in excluding the higher octant. With a
typical $\mathcal O(\mbox{meV})$ sensitivity on the effective mass
$|m_{ee}^{}|$, the neutrinoless double beta decay experiment can tell if the
funnel region really exists and hence exclude the higher solar octant. With the
sensitivity further improved to sub-meV, the two Majorana CP phases can be
simultaneously determined. Thus, the normal neutrino mass ordering clearly
shows phenomenological advantages over the inverted one.
