But you are. To be "on the level" of broken cards Ogerpon (or some kind of support card they can use, see: Electric Generator) would need to be equally broken. Teal Mask Ogerpon is probably most similar to Miraidon ex in being a basic with some kind of set-up Ability. Miraidon ex is barely in Tier 1 now and yet, printing another set of cards on the level of Miraidon ex + Electric Generator would ruin any plans at de-escalating the powercreep.
Speaking from a place of experience, Pokemon TCG is not in a situation where things can be powered down while making the new sets exciting for competitive players. In most cases you could slightly power-up some underpowered sub-set of cards to make them exciting, but Pokemon TCG has currently maxed out every branch of cards and every mechanic available. Card draw, acceleration, damage output, health pools, set-up speed and many more. As you've pointed out yourself, we are at a point where a Rare Candy, a card that allows you to skip a core mechanic of the game, is considered to be a drawback.
Finally, I am assuming you are asking for a slower de-powering, perhaps introducing a few Tier 2 decks along the way as we move away from F and G blocks. I believe that would only prolong the suffering and do nothing about the hegemony of cards like TCharizard ex, leading people to complain an equal amount, but ruining any chance at having a great and balanced H block. Who could have predicted that designing five-to-seven incredibly broken decks that give you every resource for free is going to have terrible consequences after rotation. At this point it's better to rip off the band-aid - PTCG is in a unique situation where they can absolutely nuke the powerlevel of H-on and continue selling cards with minimal impact.
Again, this has nothing to do with quality of the evaluation, but the main driver of powercreep in most competitive games - it is the players inadvertently asking for it.