Hi Johannes_Vink - I am assuming you are referring to a General Purpose database with 128 cores. IOPS did increase compared to an 80-core database, from 12,800 to 16,000 (see resource limits documentation). Log rate remains at 50 MB/s, just like for all General Purpose databases with cores in the 12-80 range.
It is true that for many SQL workloads a demand for 128 cores would be coupled with a demand for much higher log rate. But there are exceptions, such as mostly or exclusively read-only workloads that are CPU-bound or memory-bound. While such workloads are less common, we do have customers successfully using General Purpose databases with a large number of cores. This lets them achieve significant cost savings compared to similarly sized Business Critical databases with higher IOPS and log rate.