Guide on adding a new model, animation, and creature to HoMMV

Essentially, it's the same division, but broken down into logical groups. There's no dumping everything into one pile anywhere.

These aren't logical groups; they're different folders with very long, distinct root paths. There's more grouping of files (apparently, the developers themselves realized over time that this was more convenient). Compare the files of, say, a light creature, i.e., a creature from the original game (scattered throughout the archive), and, for example, Orc creatures (for Orcs, the model, geometry, skeleton, animset, animations, materials, textures, and character, i.e., most of the creature's files, will be in one folder somewhere in the characters; there's no point in arguing here; just take a look).

Added 9 minutes later

The system of dumping everything into one pile is bad (it seems bad to me) because it violates the main concept of distributing game resources.

What I don't understand is why violating the main concept is bad in your opinion. If the concept is flawed and the developers themselves eventually abandoned it in favor of a more convenient one that doesn't waste time unnecessarily.

But, as you rightly pointed out, everyone has the right to do what is convenient for them. Sorry if I'm being too insistent on my approach or somehow pressuring you; I didn't mean to create negativity; I just think this approach has an objective advantage, i.e., reducing the time spent on routine file copying.
Maybe later, just for a test, try it once, do it according to my scheme; maybe you'll find it more convenient too.

I just find it very difficult to understand why someone would choose to do 20+ actions when they can achieve the same result by doing just one.