And some just reduce the window of food intake within the day. E.g. leangains is 16 hours fasted, 8 hours or less eating window.

> IF is much less about weight than it is the other, generally scientifically demonstrated benefits of reduced caloric intake

That depends on the type of IF. Again Leangains is not specifically about calorie reduction, but about obtaining some of the benefit of being in a fasted state part of the day coupled with avoiding adding body fat, which for many who uses Leangains still means consciously adding weight.