Because I derp'd and made a mistake. I thought 3800mhz cl14 samsung b-die was going to be faster than the 3600mhz cl16 hynix I had.
Turns out that was wrong based on all the benchmarks floating around now. 2x8gb kits are typically single rank memory. 2x16gb kits are dual rank. The hynix I had before was a 2x16gb dual rank kit.
I can drop another $200 on an identical kit if I want to go to dual rank. Debatable whether it's worth it at this point.
Seems like this stuff would rock, but good luck finding it in stock.