Dropping Via from a response is roughly in the same category as ignoring the TCP Urgent flag. Most widely used standards have vestigial bits.
Re:HTTP headers we don't want
by AstralStorm on Wednesday May 16, 2018 @03:49AM
(#17080688)
A lot of hardware silently edits TOS flags, causing trouble with ECN and diff-serv...
Ignoring is usually fine. Dropping is not.
I agree that standards can and should be replaced/amended to over time, but I kinda see what GP's point is getting at.