Huff enables the construction of EVM assembly macros - blocks of bytecode that can be rigorously tested and evaluated. Macros can themselves be composed of Huff macros.
Huff doesn't hide the workings of the EVM behind syntactic sugar. In fact, Huff doesn't hide anything at all. Huff does not have variables, instead directly exposing the EVM's program stack to the developer to be directly manipulated.
Huff supports a form of templating - Huff macros can accept template parameters, which in turn are Huff macros. This allows for customizable macros that are ideal for loop unrolling.
Huff algorithms can be broken down into their constituent macros and rigorously ested without having to split the algorithm into functions and invoke jump instructions.