Developers can be lazy and/or just not care about running an up-to-date version of Arcanist. OTOH our Phabricator install is usually pretty-much up-to-date.
Whenever devs email me with errors they are having with Arcanist, my number one advice is to tell them to update. It would be useful if `arc` could perform a conduit call to query if some feature is available in a newer version. This obviously won't work for all features, but seems feasible for:
- Does a linter exist?
- Does a linter code exist?
- Does a command exist?