Porygon is too op for our current meta, bronzor heatproof still fears +1 discharge, while Munchlax is forced to recycle till it gets crit'd / status'd. Timid eviolite Download Pory can come onto 85% HP Timbur like a champ, and spam Psychic/ Tri atk, while Timburr must either mach punch and sac itself, or switch to something else that will probably get destroyed by +1 pory.
And No, unbanning the most centralizing poke ( Mienfoo ) won't do the meta any good, unless it is restricted from Regenerator.
Certainly Trubbish walls Timburr, but in the event of Uturn, Mienfoo heals hp while gaining momentum and bringing in something that can deal with Trubbish, Mankey can uturn but it doesn't heal from hazards next turn while switching out. Mienfoo on the other hand has the speed, the bulk, can heal by switching out, can get momentum with uturn, can setup with SD or Bulk up, can run knock off, etc.
Maybe Mienfoo will be less annoying the day we have hidden abilities.