Collision Detection

[Kafeen]

First of all, that's your (albeit wrong) definition.

in·ter·act/ˌintərˈakt/
Verb: Act in such a way as to have an effect on another;

Standing there isn't having an effect on your character. Therefore, its not interaction.
Moving your character, is having an effect on your character. Therefore, interaction.

Second of all, there's a FFXIV jail zone for a reason. If people are being jerks then they can get arrested. If I'm abusing someone in /shout channel, I get arrested. Same thing. It's as simple as that. You act like there's no course of action for griefers in this game.

True but we've seen how many bots go unchecked. What makes you think it will be different here? Even if they are sent to the jail zone, how long will that take for a GM to act? If you're unable to get where you're wanting to go its pretty inconvenient.

And third of all, making it so that players can only push others within a certain radius of their point-of-origin means that they cannot abuse it by pushing players to the other edge of Eorzea.

I see, you meant withing a radius of their original location. Fair point, I thought you meant push characters within a radius of your character.

If SE wants to implement it, then they can. Looking for trivial problems which have obvious solutions is not a reason not to implement something. As I mentioned, other games have collision detection and those games don't earn a 4.5/10 rating and the world doesn't end because they decided to go a more realistic approach.

Trivial problems such as only a limited number of non-colliding objects can fill a certain space? How is this a trivial problem with obvious solutions? How many characters will your character be able to push if there are too many people stood too close? What if someone else's character is pushing from the other side? You could rely on people being civil and not causing these problems for each other but unfortunately you can't guarantee it.