Have you shot Uuhka's? What you are describing is very similar to what people often say of Uuhka's compared to conventional limbs. Is Hoyt the middle ground?
I shoot Barebow, so the topic of a 'wall' is an academically interesting one for me. In theory, it should help reinforce my anchor by creating a 'feel' at the back end. But if that wall is being created due to a sudden increase in weight, then any inconsistencies in my anchor will show vertically on the target. Therefore, would a limb with a smoother wall be more forgiving for barebow because the weight variance is less when within the anchor's range?
Or do I have it all wrong?
You are spot on. Limbs are designed to give a specific increment of poundage at full draw, which can be measured in percentage of poundage/inch, between 27" and 31". Lower the the number, the "smoother" the limbs and by definition more forgiving they are to small changes in draw length. This of course favours BB crawl errors (and lateral tuning) and those that pull through the cliker.
But nothing comes for free, so weakening the top part of the limbs increasing the top part of the curve to get this effect, may compromise torsional stability. So the more you weaken them, the more you have to cross-reinforce them to combat the countereffect, increasing the weight in the top area and therefore reducing the speed. Not to mention that extreme curves need a much lower brace to release the arrow on the line, so becoming more critical in tuning and handling.
The so-called "traditional Earl Hoyt" curve is the most used curve for basic and medium-end limbs, universally recognized as the best general compromise. But in the years, exploring different materials and different structures, other curves and solutions have been tested by makers, and they continue to test them to find the holy grail of very fast, very soft but very stiff limb.
From the other end, some top-level archers, generally in recurve Olympic, prefer an almost real wall at their position under cliker, so a few limbs are still made with a steeper "wall".
So, there is a market for all solutions, that mainly depends on the user and his shooting style and division. Some companies offer both solutions, some others are concentrated on una only, some others are still exploring super curved solutions and weak tip solutions, some have found their own "perfect" compromise and are still in it for almost all limbs they make.