Full disclosure; I like bounded accuracy. I think it has a lot of advantages . However, it isn’t truly bounded, because as you increase in level, although your chances of success don’t really increase much, your dividends for being successful do. In other words you are not much more likely to hit, but when you do you do more damage (though this is balanced by opponents tending to have more HP)
This is all cool and the gang, and what makes the BA a good system. My concern is that the “increased payoff” doesn’t carry across to skills. With skills, you have the same flattening of success, but I don’t see a mechanic that provides the “bigger payoff” for skills. I realise that it is harder to do with skills because the rewards for success are often more abstract , 25HP damage is 5 times more than 5 HP, what would an equivalent be with diplomacy? With Knowledge ?
Some scenarios it does make sense for however, for instance bartering. A starting character might need to beat a 13 to get a discount, and that discount might be 15%, or 10 gp. The same character at level 10 might still have to beat a similar number, but the payoff might now be a 50% discount.