I think most players would not like having to swap armor for each biome they enter. If you only ever play in one biome, or rarely change biomes, then it isn't a big deal, but if you regularly travel around different biomes, it would be a hassle without any real positive to offset that. So I really wouldn't like a bunch of mods that need swapped just to get the right protection. I prefer a single item that protects against all biomes once complete. After all, it is intended to be something you can overcome, allowing for progression instead of jumping to the "best" biome immediately.
I would like actual weather, but I would want to be eventually able to protect against all of it without having to swap mods or armor all the time.
As for the forest being easy... That is what they want. They want it to be the starter area. Even though many of us prefer staying there for our base because of aesthetics, it is intended to be easy. If people want more challenge, tell have to go somewhere else. And as far as realism, a forest isn't that hard to survive in. Lots of food and water sources (real life), protection from weather to some extent, wood for fires, and so on. And a first isn't even all that dangerous unless you do foolish things. The other biomes in real life would be far harder to survive in. So it makes sense even from a realistic standpoint.