On Fri, 29 Jul 2022 21:12:58 -0700 Stephen Hemminger wrote:

We removed decnet support from iproute2 several years ago.
Seriously doubt anyone is still using decnet on Linux except in a computer history museum.

Like IPX, propose it gets moved to staging in next LTS?

I'd just delete it. But the cost to benefit of keeping it in stable 
for a while is subjective (and the considerations theoretical given 
how little experience we have deleting stuff) -- so whichever way you
prefer.