Moderate drinking some days but not others, perhaps your liver/brain do better because they get "total rest days", whereas light/moderate drinking every day may put them in a constant state of irritation or stress. Just like with workouts.
Given how xenobiotic metabolism ("drug tolerance") works, I would expect the opposite: that your liver would be perfectly fine with a sustained stress exactly under the threshold at which it is capable of dealing with it, and this state would be indistinguishable from consuming no alcohol at all. But go one hair more, and now you'll have a chronic but mild stress-state on the liver, with the formation of dangerous side-products (like NAPQI in tylenol metabolism) but only in tiny amounts, such that the small amounts of damage done by the side-products will be noticed and repaired, and the chemicals themselves flushed out by the excretory system before more damage can happen.
On the other hand, single, monstrously large doses ("binge drinking") will tend to lead to the formation of large amounts of such side-products, which will be highly available to react with other organic chemicals nearby and thus cause large amounts of long-term damage—weakening the body in ways that make repair harder—before they can be removed.
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Given how xenobiotic metabolism ("drug tolerance") works, I would expect the opposite: that your liver would be perfectly fine with a sustained stress exactly under the threshold at which it is capable of dealing with it, and this state would be indistinguishable from consuming no alcohol at all. But go one hair more, and now you'll have a chronic but mild stress-state on the liver, with the formation of dangerous side-products (like NAPQI in tylenol metabolism) but only in tiny amounts, such that the small amounts of damage done by the side-products will be noticed and repaired, and the chemicals themselves flushed out by the excretory system before more damage can happen.
On the other hand, single, monstrously large doses ("binge drinking") will tend to lead to the formation of large amounts of such side-products, which will be highly available to react with other organic chemicals nearby and thus cause large amounts of long-term damage—weakening the body in ways that make repair harder—before they can be removed.