Arm's Cortex A55 is not meant to set speed records. As Chips and Cheese explains, the 5-series core is designed for tasks where performance barely matters. Instead, power and area efficiency are the top priorities, making the A55 a good fit for background workloads and power-constrained designs.
The distinction matters because it shapes every design decision. Rather than pushing clocks or chasing high-end benchmarks, the A55 focuses on doing enough work while using as little energy and silicon as possible. For many systems, that trade-off is more valuable than having a faster core in the wrong place.
With only one source, there is no competing view to weigh. The article is clear about the A55's role: it is an efficiency part, not a performance part. That is not a weakness, but a deliberate positioning within Arm's core lineup.