[tw04]

That's not entirely accurate - Cisco open sourced VPP which they use in many products:

https://blogs.cisco.com/sp/a-bigger-helping-of-internet-plea...

https://docs.fd.io/vpp/16.09/

While they still obviously make custom ASICs, they've moved towards more software where possible.

[Hikikomori]

Pretty much everything above their small medium business ISR routers use ASIC/NPU for all traffic possible. Which routers are you referring to?

[ra1n85]

Sorry, what's not accurate here?