[ooterness]

Data integrity is ensured by the MAC layer. Ethernet's CRC32 is substantially stronger than the weak and unnecessary 16-bit IP-checksum in the UDP header. It is also infinitely easier to calculate in hardware, because it is placed where it belongs (i.e., after the end of protected data).

I acknowledge that PTP is not that widespread, but this isoteric issue is emblematic of broader overreach with the IPv6 design. This decision is one of dozens (hundreds?) that are nice-to-have for many users, but catastrophically disruptive for others.

Such concerns are individually minor, but I assert that they collectively represent a significant barrier to adoption.