Both HP cores have single-precision FPU. But only HP core 1 has SIMD, unlike S3 and P4.

Sadly this S31 can address up to 64 MiB of PSRAM at most. And only 32 MiB SKU has been released.

For compatibility and simplicity. Most SIMD instructions in P4 and S31 (compatible with P4 rev 3.x) are an direct evolution from S3. Espressif just doesn't want to rewrite their optimized assembly libraries.