Honestly, Chatter is relatively splashable due to its 100% accuracy, ability to bypass substitutes, good PP, okay BP (65 isn't bad tbh, just a bit less than Espeed), Taunt immunity, and no immunities outside of Soundproof (which Mold Breaker can ignore anyway). Combine all of these factors with the confusionhax letting pretty much any offensive mon hax their way past their counters, Aerilate MRay being probably the best upcoming example in gen 7 because of STAB and the like, and you got a move that's honestly dumb in the meta.I just wanted to inquire more on why Chatter was not considered to be brought back. Iirc, Gale Wings was the main proponent that made Chatter truly difficult to deal with as it could be used on defensive threats to hax out turns, and with the Gale Wings nerf it is much harder to pull off as consistently. Ik the mechanic of Chatter giving out confusions while being a move is still the same, but we also still have Dynamic Punch and Swagger that relatively do the same things. Maybe I am wrong, but can someone explain it to me?
As for the other moves you mentioned, Dynamic Punch requires No Guard to be run otherwise you risk missing half the time, not to mention Tina and Aegis which are common things are immune to it, and Swagger can just be bounced back or taunted before it happens