Metro-aggregation networks have unique require- ments: capacity and cost targets in between those of the access and metro-core networks they interconnect, and survivability to (at least) single failures. Meeting these requirements can be achieved via low-cost pluggable transceivers and cost-effective optical nodes, deployed over a horseshoe topology. By maintaining connectivity between each (leaf) node and the hub nodes at the extremes of the horseshoe, survivability to single link or node failures is guaranteed. However, in certain countries/regions, frequent power outages or enforcement of load shedding can make these networks temporarily vulnerable to single failures. Recently, it has been shown that resiliency against these events can be improved by adopting a filterless node architecture and minimizing the utilization of active devices in the express path of the optical signals. This paper extends the seminal work by proposing extensions to the original design framework that allow it to cover a larger number of network scenarios. Moreover, it reports the outcome of a comprehensive set of network simulations that provide insight into the impact that the coupler types used to realize the optical nodes have on both the number of required optical amplifiers and the vulnerability to local power outages and load shedding.