This my friend, i want to explain (from my PoV)
It's because of the time and effort (and of course emotions) I put into beating those Turns... it is not like a static goes in there, try 4-5 times and cake is eaten.
We managed to Down T9 last week for the first time, after weeks of frustrating wipes, over and over. Not to mention the Ton's of Gil burned away for Buffood and Repairs.
Also on a personal level, how many times your significant other was disappointed, because you sat staring at a screen until 3 o'clock instead of doing something with him/her...
You really sacrifice a lot for this.
So imagine you are a Sports Athlete, you train years of years, and achieve to set the World Record in Pole Vaulting. Now you retire and the year after your record get's vaporised because they now allow rocket-driven shoes ;-)
Of course, beating Coil it is a virtual achievment - not to be compared with professional Sports. But still, we feel betrayed by the fact that what we achieved now get's literally handed out on the silver plate, just because some do not have the endurance to do it the way it was designed for.