my opinion
I have usually found that when someone asks that question they have already made up their mind and just want someone to confirm their choice.
There are many beliefs, ideas and opinions on the subject so why not voice my own.
It is not truly worth the risk. Yes, there are a lot of people who keep multiple corns together with success, BUT,
there are things to consider.
If one of the snakes regurgitates its food or has a runny stool there is no way to tell which one has the problem.
If one gets sick it is a pretty high likelihood that the other will also.
Some corns are stressed by the presence of other snakes. You might have one or both of the snakes have eating problems and possibly other problems due to stress.
There is always a chance of cannibalism. Even if you separate the snakes when feeding there is the possibility that the lingering smell of mouse could trigger a feeding response in one of the snakes. On feeding day you have two and the next day you look into the container to see only one and that one is extremely full. There is also a good chance that this hatchling could die if it can't digest a meal of that size. Cannibalism isn't common but it has happened. It is a possibility.
If you keep a male and female together you could be asking for trouble. There is always the chance they will breed before the female is actually old enough or large enough to carry the eggs successfully. She could become eggbound and even die. Also fairly uncommon but it too has happened.
So, you say well I'll keep two males or two females together. Most people who acquire hatchlings do not know their sex. It is easy for even experienced breeders to miss sex very young snakes. Some people won't find out the sex of their snakes until later on but will rationalize "well, they've been together this ling, it shouldn't be a problem." but it Can be a problem.
I have kept snakes together without problems but have made a choice to keep them separate.
There is no real clear argument on why you should keep them together but there are clear arguments as to why you should not.
So, in my opinion, although people do it successfully I just don't think it is worth the risk.