In my eyes this whole fatigue system is a bad idea. In the end it affects only a few people and then only as an annoyance, therefore it should be just removed.
I don't think they should get rid of the surplus / fatigue system, I think the penalty should even be harsher so that it's actually a deterrent to grinding through it. The penalty just doesn't have enough teeth to effectuate the desired result. I do agree with you though that it only affects a small contingent of the game population.
You really think that getting 10% less sp is a reason to stop crafting? Seriously, this is just an annoyance and no reason to stop.
This is the reaction of almost everyone who is actually affected by the surplus / fatigue system. The people who run into this artificial barrier are the XIV addicts logging some serious hours. (No offense intended, I'm just jealous ><) If your RL allows you to play for 5, 6, 7 hours a day, you can probably find an extra hour or so to make up for that 10% SP difference.