Probably difficulty in bleeding the air out of the clutch system. Many of them are hard enough to bleed with DOT3.

If the silicone brake fluid has a problem it is with air entrainment. That is well-known, it'd probably respond to backwards pressure filling from the bottom of a can. Air gets entrained from shaking or from a free jet entering the liquid's surface in a container.

Now on the DOT3...if you think that DOT3 is better because it absorbs water, you haven't ever had your brakes vaporlock. I have. It's not a happy feeling to be facing a seven mile 8% grade and have the brake pedal go to the floor.
The brake fluid maximum boiling temperature is with the fluid being completely dry. As the hyGroscopic brake fluid picks up water, the boiling point decreases. That's one reason to change your brake fluid every couple of years.

So take your pick, use what you like, but don't think that just because the brake fluid absorbs the water that it's better!

Oh, one more thing...the DOT3 will hold different amounts of water depending on the temperature. So if the brake fluid is saturated with water and the temperature drops, what happens to the water? It comes out of solution and forms water pockets in the low spots. That's why brake cylinders have rust pits in the bottom of the bore.

R.