Dudes.. It's like this in any game.
You always make the easiest to make item. Nothing more.
In World of Warcraft, I can never recall myself levelling Alchemy using the hard to get materials, only the easy to get materials. Regardless of what you crafted it still rewarded you with the same amount of skill exp if they were both orange/yellow/green or both had the same required skill level.
The -ONLY- game where I've seen a difference in how much skill exp you got from a skill would be Vanguard: Saga of Heroes. They rewarded you with experience depending on the quality of the finished product.
You can hardly call it a broken system. More likely you can call it 'MrDDT not satisfied.' but then MrDDT wouldn't be satisfied with all that many crafting systems
.
- The main difference is, that instead of having to move up from recipes once every few skill levels (usually 20-25 for some reason) you'd had to make the next skill area's easiest to make item. In Xsyon you don't have to. That might be the 'broken' part in this system, but that is about all I can spot.