People are free to play the game how they please. However, Nintendo is also free to handle those players how they please. Also, just make sure if you're one of the modders, please don't do things that would effect other players negatively.
I think hacking is cool. It's always nice to see what community members can come up with, and this is especially true when they can go beyond the normal boundaries of the game. I think it helps that you can't really cheat in AC. (Compared to Splatoon, where people are obviously disadvantaged from cheating)
I'll always miss my item trees and Harv's fences.
Look as long as they're not purposely corrupting people's saves like how hackers used to on Wild World, it doesn't affect me. When I played New Leaf I went to a few hacked towns and thought they were absolutely fascinating
