We're not talking about deprecating language constructs though. This issue is only talking about deprecating a sub command in favour of another sub command from literally the same binary. This should take all of 10 seconds for the developer to adjust to. I'm all for pragmatism but lets not exaggerate the significance of this proposal.

And it might well be that the deprecation notice will run for two versions. At the moment no official decision has been made as it is still an active issue.