Frontier has also demonstrated in the past the ability to detect "Long Running Macros", and let's not forget about their glorious sweep of the module engineering exploit. It's just that these things have to be prioritized, investigated, documented - there's an entire process that needs to be worked before action can or should be taken. And it takes more than a simple "Wah, someone cheated!" post here with an expectation of what? That person so accused is instantly banned? A special MI-6 task force is dispatched to their home to drag them out of bed and give them a flogging? Or the magical "I Win" button appears on your screen?
Let's put this into a better perspective - we can all agree that Frontier does not want, welcome or condone cheating. Now where does this factor in to a much bigger picture? That is, how do you prioritize addressing this in comparison to something like: If anyone equips this particular module and then attempts to engineer it, it applies the wrong modification, and the next time that person tries to log in, their client crashes because of this (happened during the Engineers beta), or If more than 4 people enter an instance in this particular system at the same time, a memory leak starts in the Matchmaking Server and destabilizes the game for everyone.
Clearly, if you are a rational, even moderately intelligent person, you realize that game-breaking, server-crashing, wide-reaching issues need to be addressed before something as relatively minor as this - and yes, this really is relatively minor in comparison. This doesn't break the game, just the arbitrary rules that are not required to make the software functional, but exist merely to attempt to reign in human behaviors.
Here's another way to look at it - the word: "******", but let's just assume that whatever that word happens to be, was not filtered by profanity filter. It's vulgar, makes some people cry to see, and yet, for some reason, the chat filter lets it right on through. Should all work on all other areas of the game be stopped to fix this? Does the word "******" showing up render the game unplayable? No, it doesn't. Sure, you may not like seeing "******" on your screen, but that doesn't stop you from being able to play.
On the flip side, something like "******" might make its way up to the top of a fix-list a lot sooner than something like "In the flavor text for missions hauling biowaste, biowaste is mis-spelled as "biowaist".
Is cheating a problem? Sure. Is it game-breaking, universe-ending, insolvency-causing? No.