But it really isn´t. That is simply a widely spread misconception, but is not more difficult to control thin picks, because they don´t give as much as people believes, and they recover their normal shape ultra fast.
You can make tremolo picking with the minimum amount of movement with a .36 nylon without problem.
It is just a different feel, and a different tone, and most players simply abandon thin picks too soon to realize that they are as easy to control as the other ones. And they do it because they don´t like the tone/fell of the pick, and that´s a perfectly valid reason, but then spread the believe that they are more difficult to control, which is not the case.
Stiffer picks tone are what most people prefer, and I think that is the key to the success of this Flow line of picks. The shape of the pick has been around for a long time (except for the “mini” Petrucci model, all others have the Dunlop 208 shape), but some of the gauges they have been offering (2.0, 2.5, 3.0 and now 4.2) are the ones that a lot of people are starting to use more and more because the increasing popularity of boutique and hand made pick brands, which usually moves on the very thick side.
I have the Andy James model and the Petrucci, and will surely buy the 4.2 when I can. I think they are very nice, they make a little too much chirp noise, but they feel very good. The new tortex versions announced at NAMM doesn´t interest me that much, because I just prefer the same versions in the Jazz III shape.