Lets get one thing out of the way first: TPCI can always issue an emergency banning of they think that a card would break the format. They did the same thing with Shiftry.
With that being said, why on earth is Unown banned? They literally say in the announcement that “these combos haven't yet proven to be successful”. Expanded is your outlet for creativity and you stifle it on every occasion. A combo deck is certainly not loved by everyone and I'd be in favour for banning any deck that can reliably pull of a turn one / two win, unless the combo can easily be disrupted.
I can see the deck becoming an issue in the future ( in fact I was testing a list with Dedenne GX and it had some impressive results), but c'mon: how impressive would it have been if someone actually managed to get this thing to work in a bo3 setting. Live on stream!
Now, let's move over to Maxie's Hidden Ball Trick. The reasoning behind this is easier to understand. Having access to the new Omastar / Kabutops on turn one would create another instant item / supporter lock OtP, something that TPCI clearly don't like (hence the Wally ban last time).
Given that both have a condition to their ability though, I'd honestly argue that this is a case where actual tournament results and statistics would come in handy. Personally I don't really see a ban worthy thread here. Something annoying for sure, but nothing that screams ban.
Then again I guess they go the same route as with FogP, where it is easier to ban the enabler, rather than having to carefully check every Pokemon with the corresponding type in the upcoming sets, in order to prevent any ***** on turn one. I guess it's only a matter of time before Archie hits the fan as well.
Once again I have to complain about stifled creativity. In order to consistently pull off a turn one Archie / Maxie you have to carefully construct your deck and even then the first turn is usually quite tricky, as you have to solve a different puzzle each time.
Last but certainly not least, we have to talk about the elephant in the room: Zoroak GX.
I'm amazed that nothing in this deck has been touched. I've seen arguments to ban Oranguru, Zoroak GX, or even DCE. Although I don't think all of those are valid options, it's baffling to me that TPCI is destroying new archetypes before they even see the light of day while simultaneously don't fix the issues in the current format.
The shadows of the abyss are like the petals of a monstrous flower that shall blossom within the skull and expand the mind beyond what any man can bear, but whether it decays under the earth or above on green fields, or out to sea or in the very air, all shall come to revelation, and to revel, in the knowledge of the strangling fruit - and the hand of the sinner shall rejoice, for there is no sin in shadow or in light that the seeds of the dead cannot forgive...