Reasonable, yes. To lazy to cut the cheese and think about proportions. Oh, and cutting is "not safe"! Safety!

Consistency is also could be a reason too. Well-known exactly same taste each time. May be some people don't get bored from that.

But that did not answer the question about making that prepackaged kits directly from natural products. I met Russian, Chineese and Korean noodles with real dried vegetables and even vacuum-dried real meat. No noticeable price difference from similar noodles with "flavorings identical to natural vegetables/meat". Taste is not great, as usual for watered back dried products, but much better than that "chemical" thing.