There are plenty of cases where the sequential logic for an FPGA may end up resulting in something looking like a custom CPU implementation. Development wise it

There are plenty of cases where the sequential logic for an FPGA may end up resulting in something looking like a custom CPU implementation. Development wise it may end up cheaper to just pick up an existing architecture and build in custom instructions for the specific parts that make it particularly expensive (either computationally or latency wise) for a traditional CPU.