I’ve done it either way and there are pros and cons to both approaches. Leaving them all in the same tub until the first shed makes it a lot easier to keep the humidity up, since you only have to spray one tub instead of many. But separating them means you can record the date each one sheds (they usually don’t do it all the same day) and keep better records.
I also tend to sex them soon after hatching, and it’s easier to keep them separate than to try and remember which ones were male and which were female. If I leave them in together sometimes I have to sex them again. I usually try to do that as little as possible to minimize the stress on the snakes.
They all seem to start eating at their own pace. I haven’t noticed any big feeding differences between snakes that were kept together and snakes that were kept apart, but I’ve only hatched out a handful of clutches. I’d expect that separating them might reduce stress a little, but don’t have the experience to prove it. Time will tell which method suits me and my snakes.