1. You don't have to become a tax resident to obtain the
citizenship, so wealth taxes don't really matter. If for whatever reason you need to become a tax resident, you could always transfer your assets to a family member and protect yourself via friendly lien or some other way depending on your home country.
2. As far as I know, you can renounce it if it's been acquired through naturalization.
3. I literally just came back from a Disco in Esmeralda (Recoleta), it was stocked with goods. Yes, some shops are s**t but you can always just order stuff via Rappi or Glovo, which I do often.
4. You can get away with English just fine, although I would recommend learning Spanish anyway as it's spoken by half a billion people.
5. Let's be honest, Argentina is a banana republic. Even if they introduce citizenship-based taxation, which they won't, what is it that you think they would do if you decide not to pay or submit tax returns? It's not like they would request extradition or send a CIA rendition plane to pick you up...lol.