You don't need Twitter to add that, you can have that feature today - get a 3rd party Twitter client, like Fenix on Android or Tweetbot on iOS & Mac. Both have

You don't need Twitter to add that, you can have that feature today - get a 3rd party Twitter client, like Fenix on Android or Tweetbot on iOS & Mac. Both have the feature to mute by keyword (and yes, I did have Trump / Clinton / Election as mute words this year). Both are paid software, but the $15 USD for Tweetbot Mac is absolutely worth it to me... in fact, I think it's a bargain for something I use every day. (As a bonus, the third party clients are still ad-free as well, and no "while you were away" feature.)