I read and so far all arguments for little endian I see are because the CPUs adopted it so it is more efficient to keep data the same way. What are the other b

I read and so far all arguments for little endian I see are because the CPUs adopted it so it is more efficient to keep data the same way. What are the other benefits of little endian, because in terms of readability big endian makes most sense. I could understand that having things in reverse could be somehow more efficient, but why do it reverse in groups of 8 bits instead having all bits reversed?