Less stuff to juggle around when traveling.
Like when in train, there is very limited space, and using the laptops keyboard is already a pain when I have the necessary space to push the laptop away from me, for a semi comfortable arm position while typing.
And a whole moonlander with both halfs would just not work either, as you had to deal with all the cabling.
A half one though, that is tweaked correctly still allows you to type everything, and I have seen poeple really using a single half of a split with quite some speed.
