That does not count as “a very easy solution” imo. I mean, we of course thought of that 3 years ago and could have trivially implemented that. But it causes problems. So there’s this secret down input that does nothing ever except let you stand still? Weird. If that exists, so should more moves. But we were trying to keep it simple.
And separate from that, it means that playing on keyboard no longer would have the fantastic property that it currently does. There are only two buttons that your left hand has to use on keyboard (“left” and “right”) and you never have to chord them, meaning you only ever need to press one at a time. That’s unusual since every other fighting game would give you four buttons there and require constant chording of two at a time. The current way is what makes the game such a great fit on keyboard. If we ever make a mobile version (not currently planned), it will be a boon there too to have only a left/right and no extra input that you need to constantly enter when moving.
In the early days of our development, this whole issue was on our minds, that maybe we’d have to give up the good property of only two buttons for movement. But it turned out that it’s just something you get used to quickly. I haven’t thought about it for years at this point. So I think we should stick with the simple move set, no secret down command, and just left/right.