That’s a good point. The 5 has about the same memory bandwidth of an M1 Max, which is something you’ll only find in 2-socket big Xeons (NUMA excepted), but the PS4 is on the same ballpark of a Threadripper Pro. Still, they are very much PCs with memory systems that are not available in general purpose boxes of the same price.
I remember, however, some benchmarks on motherboards with console CPUs that were somewhat disappointing because the GDDR6 memory has high bandwidth at a higher latency cost that the internal caches couldn’t hide.
Still, if you can tune your workload for it, it may be an interesting compute box.