[m;]Not when the thread has a mechanical tag for a specific edition[/m;]
Anything not from that edition risks an infraction for off topic. That's why the "___ only" tags exist - as a cue to stick to that edition or post in a different thread. Thread starters can set that when they create the thread. They don't have to.
[m;]Any further discussion of the issue needs to be elsewhere on the board.[/m;]
If the original poster wants to open this thread to non-T20 mechanics, they can ask me to pull the tag. But until they do, advocating for non-T20 mechanics is off topic and infractible.