Agility "Glitch"

No game will come without bugs, to blame the Bug testing team is silly. There's always gonna be those few things that slip by anyone, to push out patches on time means everyone is rushed so things will be missed that are minor. Mainly bug testers are there to break the game, to push it to the limit and try to find the big game breaking bugs as their first priorities, minor bugs like XP being messed up isn't a frontal concern for the team.

But most of the time games don't ban you for bug abusing, unless they gave fair warning "we know about this and this is not legit GTFO" then you continue doing it I could see a ban. They'll probably just do rollbacks on the agility XP.

Well said, this is how I feel. Everyone makes mistakes, and although Jagex is paid to fix their mistakes, not everything can be caught all in the same test-run. Accidents happen, you know? It would be absolutely impossible for any gaming company, not just Jagex, to constantly release new content that is all 100% bug-free. As Steven said, the bug testers check the extremes when it comes to bugs. They check as much as they can, but they're not going to catch every single little thing.

That's why there are video game testers and beta testers for video games. Sometimes, you need to see a player's side of things to make sure everything is fully functional. It's kind of like writing an essay for a class; you write it, you proof-read it hundreds of times, but you never see any mistakes. This is because YOU'VE written it, you know everything it says, you know what it's SUPPOSED to say. But then your friend comes by, looks at the paper, and points out a spelling error in the middle. This is because they are seeing it in a different perspective and can help you a little easier because they're not used to seeing it, nor do they know what it's supposed to sound like in your head.

I also agree with Newbh in saying that of all gaming companies, Jagex seems to have the least amount of bugs/glitches in comparison with other games and how many updates they've done. Most of the other games release their updates in expansions or patches, and those aren't very often, but they're full of bugs. Jagex does a lot of updates constantly, but there aren't that many bugs in comparison. There are going to be bugs every now and then, that's just a fact. You can't avoid every single little thing that will go wrong; no one lives in a perfect world.

As for punishing players for something Jagex did? Well, it was pretty obvious that the agility jump was not intended to be the way it was. People should have understood that it was a risk to train agility that way and then decided whether or not they wanted to do it. Call me "cold" if you will, but that's just how I feel. Most agility shortcuts, as Micah said, are only meant to get you from one place to another faster, not be used as a viable training method. There was something definitely fishy about it.