Most of my shooting is done prone, and the kind of competition I like best is long range prone TR (iron sights jacket and sling) or F-Class (scope rest and bags). A key element of long range fullbore shooting is wind reading, and shooting in difficult wind conditions at long range can really "make" a fullbore experience.
But I want to offer a word of support for shooting off of benches, and for the shooting ability and wind reading ability of 100-yard and 200-yard BR shooters.
For whatever style of shooting, the rules for equipment and shooting technique end up setting a certain "baseline" performance level. In fullbore shooting, F-Class shooting is inherently able to shoot smaller groups than TR (iron sights/jacket/sling). And standard short range (100y and 200y) Benchrest is able to shoot tighter groups still than F-Class.
The fact that the "baseline" grouping ability of a certain style of shooting is bigger or smaller, does not mean that (for example) F-Class fullbore shooters don't need to be as skilled as iron sight TR shooters, because F-Class gear and shooting style is able to shoot tighter. This "baseline" just establishes a starting point, from which talented shooters are going to try their very best to win. You might have topnotch F-Class gear and figure that your super-accurate gear will "carry" you and let you slide - in comparison to a topnotch TR shooter, it might; but in comparison to a top-notch F-Class shooter, who will have gear just as accurate as yours and will be putting 100% of his talent into getting the very best possible score, well let me just say that if you want to beat him, you better put 100% of your shooting talent into it too.
As far as wind reading goes, just because standard BR is a short range game does not mean that "there's no wind" or that BR shooters are not skilled wind readers. On the contrary, short-range BR shooters are among the very best wind readers in the world - they have to be, to win.
As far as shooting technique and talent goes, the top TR shooters are just as skilled at shooting ability (but not more skilled) as the top BR shooters. Everybody at the top of the game in any division that has a good depth of competition, is about equally skilled - which is to say, they are pretty much as good as it is possible to be.
A comment on the shooting ability of BR shooters. They have gear that in zero wind is able to shoot 5-shot groups 0.1" in size. Their rifles and ammo, and shooting technique, is _so_ accurate, that even the smallest of condition changes (wind, mirage, lighting, contact pressure on the rifle stock) can affect their shot placement. In order to shoot match-winning groups, they need to absolutely master the most subtle effects. Many of the things that short-range BR shooters need to worry about in order to win matches, are such small effects that an F-Class or TR shooter can't notice (for example, in my TR and F-Class practice and match shooting, I have never been able to discern an effect on bullet point of impact caused by different amounts of holding force or cheek pressure on the rifle; my BR friends tell me that in their game this is a very, very real effect).