I mean that in the same rhetorical sense of "standing around leaning on your shovel isn't effort, let alone best effort". Of course we all understand that what is effort is digging the ditch.
Anyway, so the question is, if typical IP forwarding is "best effort" ... what is an example of poor effort, and what exhibits it?
The dropping part isn’t the effort; the forwarding part is.
> the checksums in UDP (and TCP!) also poorly assure integrity when datagrams are delivered.
That’s true, but it’s becoming less of a problem with ubiquitous encryption these days (at least on WAN connections).