The only downside to drawing on the iPad with a stylus is that you have to keep your hand and wrist off the screen, which can become uncomfortable for those artists that still draw with their wrist (which is something one ought to change anyway). Some apps claim to have wrist protection, but none of them are very good.

However, I know many artists do use the iPad and other tablets for creating art. They have changed their drawing habits and draw with their whole arm, and use the zoom feature to create detail they would normally create with their wrist touching the drawing surface.

I am not an artist, but I do enjoy drawing, and I found that a pen size stylus gives me the precision I prefer, and doesn't obscure much of the screen. I suspect the Cosmonaut would obscure more of the screen, being a thicker tool. This is something that is up to the user's preference, though - he might prefer a larger grip, or weight.

Be prepared to test out a dozen or more drawing apps. I found procreate meets my needs, but I also have several others, and each has merits to recommend it.

From a FAQ of Smudge Guard:

Unfortunately, the current SG gloves are not compatible with the iPad at all. The SG glove does not prevent detection on the iPad. :(

However, please note that recently, two other customers of mine bought the SG glove and tested it while sketching on the Autodesk Sketchbook Pro. They said it did not prevent accidental strokes with their palm because the material/fabric was not thick enough. But cleverly, my two other customers then tried slipping in a microfiber cloth, (folded in half) into the side of the glove. The microfiber they used, were those little rectangular shaped cloths that are made to clean eyeglasses. They inserted it into the glove (where the edge of the hand is) and they said it worked! The iPad didn't detect the side of their hand.

There is also an info they started working on a fully-iPad compatible glove. Microfiber option could work with any thin glove, perhaps.