Imho.....the high rib on some trapguns are to simply dissipate heat waves that can distort your view of the target on a hot day.
The ADJUSTABLE rib can be adjusted to change the point of impact.
Not all high ribs are adjustable.
While they do dissapate heat better, the reason is to put a higher percentage of the shot load
above the point of aim. This is usually expressed as a percentage, i. e., 60/40 or 70/30. A field rib is 50/50, which is why you have to 'cover the bird', fire and follow through (on straight aways and slight angles; obviously you have to lead more on higher angles.) With a 70/30 barrel, you put the bead on the target's bottom, and fire. (again, with more lead on harder angles) In Trap, the bird is rising, and you should shoot it while it still is rising. (Unless you are shooting an Aniie Oakley, and you are shooter #4 or 5...) Generally a fixed high rib of 70/30 is fine for Trap, Sporting Clays shooters usually prefer 60/40, or even 50/50, as do Skeet shooters. Adjustable ribs can go from 50/50 to as high as 90/10. (The main use for that would be a shooter that is on the 27 yard line.)
Just for fun, try mounting the gun higher on your shoulder. That can keep your head a bit more upright and natural position which might keep you from raising your head.
A Morgan pad as 243winxb suggests will do this, without the resulting increase in recoil impulse.
Or adding an adjustable comb...
https://graco-corp.com/product-category/adjustable-comb-hardware/
Does it create any alignment problems versus a regular rib? Are there any distinct advantages to one, so that it should be worthy of serious consideration?
Well, it can mess with your live game shooting, but fairly easy to learn the difference in shooting two or even three different rib types. The advantage for Trap, as Colt Python Elite pointed out, is that you don't have to cover the bird with your barrel, as with a field rib; it usually improves most shooter's scores.