What are your thoughts on roll-under/roll-high mechanics?

In fact, in the two blackjack percentile-roll-low systems I know (Mythras and Eclipse Phase) assigning skill modifiers is pretty common.
The Troubleshooters has a math-less system for skill modifiers. If something is at +/- N "pips", you look at the ones digit on the d100. If it's in the range of 1 to N, you automatically succeed (for +) or fail (for -).

So if your skill value is 58%, and you're at +2 pips, you succeed on 01 to 58 as well as 61, 62, 71, 72, 81, 82, 91, and 92. No addition or subtraction needed.
 

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I'm interested in your opinion of roll-under/roll-high mechanics. The way they work is like this: you roll your die or dice (in the White Hack's case, for example, a d20). You want to roll equal to or under your Attribute or skill. But, within that metric, you want to roll as high as possible. So, if your Dexterity is 13, you want to roll equal to or under 13, with a 13 being the best-case scenario. It has been referred to as a Blackjack-adjacent mechanic. What I like about it is that roll-under is very easy to understand, and the roll-high aspect of it gives characters of higher skill the potential to reach levels of success that other characters can't. And there is no pesky math, for those who don't like adding modifiers. I've been playing around with it for my own game, using 2d10 instead of 1d20. One of the dice is the Alpha Die. That die determines your base damage if your attack is successful in combat...meaning that a character with higher skill can do more damage than someone with lower skill. What are your thoughts on the mechanic in general?
Personally, I don't like either as much as I like "High but not over" (used in Pendragon, Jackals, and AD&D 2E Psionics).
Ranking them, High but not over, high, low. But... the difference in preference twixt high vs low is tiny.

Also noting: I asked fourth graders, 5th graders, and 6th graders which they preferred back in the 2010's... 4th didn;t care twixt high/low, but 5th and 6th both had a clear high preference.
 

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