  Low temperature structural and superfluid properties of $^4$He confined in
cylindrical nanopores are theoretically investigated by means of first
principle Quantum Monte Carlo (QMC) simulations. We vary the density of $^4$He
inside the pore, as well as the pore diameter and the potential describing the
interaction of each $^4$He atom with the pore surface. Accordingly, the $^4$He
fluid inside the pore forms either a single channel along the axis, or a series
of concentric cylindrical shells, with varying degrees of shell overlap. In the
limit of pore length greatly exceeding its radius, the $^4$He fluid always
displays markedly one-dimensional behavior, with no "dimensional crossover"
above some specific pore radius and/or as multiple concentric shells form, in
contrast to what recently claimed by other authors [Phys. Rev. B 101, 104505
(2020)]. Indeed, the predicted robustness of one-dimensional physics suggests
that this system may offer a broadly viable pathway to the experimental
observation of exotic behavior of, e.g., junctions of interacting
Tomonaga-Luttinger liquids, in an appropriately designed network of nanopores.
