Inconsistency in parallelhelpers?

The function prepareLinearAlgebraParallel in dumux/linear/parallelhelpers.hh has, among others, two template parameters LinearSolverTraits and ParallelTraits. It receives three parameters

std::shared_ptr<typename ParallelTraits::...>& comm, fop, sp.

ParallelTraits is then used for branching between an overlapping and a nonoverlapping treatment.

Later on, actual values are assigned to these parameters not employing the types shown above, but rather in terms of, for example,

using Traits = typename LinearSolverTraits::template ParallelNonoverlapping<Matrix, Vector>;
comm = std::make_shared<typename Traits::Comm>(pHelper.gridView().comm(), category);

The local alias Traits should always coincide with the template parameter ParallelTraits, otherwise the assigments won't work.

To me, using the local alias is confusing. Can it be deleted or was it done on purpose? Maybe it's a leftover from the time before if constexpr?