  Topological superconductors have long been sought for their potential use in
quantum computing. The type-II Weyl semimetal MoTe$_{2}$ is an obvious
candidate, exhibiting a superconducting state below 500 mK at ambient pressure,
but the question remains whether the pairing is conventional $s^{++}$ or
topological $s^{+-}$. The application of external pressure favors the
superconducting state in MoTe$_{2}$ and suppresses the structural transition
from $1T'$ to $T_{d}$. The competition between the two structures leads to a
mixed phase that strongly enhances the disorder present in the system,
remarkably without affecting the superconducting transition temperature, in
contrast to the expectation of $s^{+-}$ pairing superconductivity. Our thorough
analysis of the electrical and Hall resistivities as a function of pressure
yields the most accurate temperature-pressure phase diagram available to date
for MoTe$_{2}$ and a detailed view of the relationship between disorder and
superconductivity, supporting a conventional $s^{++}$ pairing symmetry.
