I think access to offload engines is a big part of the appeal of dpdk still, especially for me all the GPUdirect nvidia-only packet steerer.

I need to check about the af_xdp ecosystem around fragmentation/reassembly in UDP too, every time I needed something there DPDK had it, often with an offload path.

Some silly stuff in DPDK are very useful for testing too (in-memory devices).

Also I'm not clear on the virtualization story on af_xdp, with dpdk I got something working at full blast 400G in VMs with little (but finnicky) work.