I think you're seeing hostility and malicious intent where there is none. If I remember correctly, the answer happened at a point where alcohol might have had an effect and I think he was just surprised and amused that someone would ask about such a featureless feature. There's no gameplay difference between running and walking, there's no precision benefit you would get in other games since your movement is as accurate as your mouse cursor is and it seemed like they have received way more comments about how the party moves too slow even in fast mode and that they should add faster movement. Asking for a feature all about going slower seems like such a niche feature that it could easily fly under the radar and land in the infinite backlog.
Heck, I was laughing with him. Until I saw this thread, I didn't think anyone would seriously ask for such a "feature" and that had to be a troll/joking question about how slow the party already moves.
Walking is about immersion, and immersion is what I'm after when i'm playing an RPG. It'd be weird if what I'm saying now would be a surprise to a veteran gamer/developer such as him, because if you ask most any hardcore roleplayer, one of the first things you'll hear is to walk everywhere it's appropriate to walk.
Besides Pillars, I don't remember the last RPG I played that didn't have walking. Some have been more annoying about it than others(having it be a button you hold instead of a toggle), but they've all had it.