Remember when you could talk 'bout a game or something random and post your drawings on the Wii U and 3DS? yeah........ I think it was bad idea to shut down Miiverse for the following reasons:

1. It was original. things like Xbox Live and PlayStation Network just had direct messages where you can only talk with the person you are chatting to. While Nintendo had his own social media where if you post something, everyone with a Wii U or 3DS with access to the internet could see.
2. The friends on your Nintendo system have less funtions. The only thing that you can do with friends onto the system is just play with him, more funtionalities is in the Nintendo Switch Online app, which is dumb because you can easily do with things like Discord or Skype.

If one day Nintendo takes the ide a to bring Miiverse, they need to add things like child safety (Examples: censoring inapropiate posts and drawings and make communities for M rated or above games invisible for them) I really hope they would put miiverse back.....