I guess in some cases it is better to change things then try and police exploitable mechanics. That said, Eve is a game where mechanics are tested and theorycrafted in ways where the player can leverage knowledge over another player. There are plenty of exploitable mechanics - some are off limits while others are not.
You also used to be able to avoid CONCORD if you spawned them right on a grid wall. They spawn space-north when you go GCC and if you were right on a grid wall they would spawn on the other side, allowing you free reign on the target ship. This of course is an exploit and will get you banned. Using grid walls to hide my Hyperdunking, even in Jita was a real fun way to use the mechanic.
Just because something isn’t well known doesn’t mean it’s bad. Players that go through the effort to truely roll around in the sandbox and experiment with mechanics ought to not be punished just because they have knowledge of mechanics that others don’t.
I’ve never seen grid-fu used in an actual fight though, so I can’t speak to how weird or broken it might have been there.