Okay, I will be the oddball here, I have two puppies, two littermates, male and female (see below) they may not look like littermates, but they are lol. And we have had no difficulties. They sometimes sleep separate, sometimes together. I take them out separately for walks most of the time, sometimes together with my father, but mainly they are out separately.
There is no problem with feeding, they stick to their own bowls, we tell them "ladies first" and put down Maddie's food, Zack waits his turn for his bowl to be placed on the other side of the kitchen table with no fuss whatsoever.
We make sure to get in separate play time/training time. They come individually when only one is called.
We have had great success with them thus far. We had two dogs together (who weren't littermates) back when I was a child, a husky and a beagle, who were wonderful, after they passed, we got just one dog. Because my mother works from home, he got very attached to her, the separation anxiety was horrible. She could go outside the front of the house, he would cry by the door, and when she came back in (even if it was 5 minutes) he would act as though he hadn't seen her in a week. Don't even get me started when she was away for a week. No one slept.
In my house, we don't have to worry abotu having two crates because we don't use crates, the dogs have free run of the house, with no problems at all.
So, I think that if you are willing to put the time in and effort for the pups, it isn't a totally bad idea. My family is doing it wonderfully.