You're absolutely right! Can't believe those slipped my mind. That really could be what they're going for here!
As much as I love the Neo Destiny set, the Shining chase rares from it and the two from Neo Revelations were a massive "miss". Partially because their attacks were usually expensive, hard to fulfill, and/or largely ineffective. It was also difficult to implement them in existing decks because the attack costs were so bizarre.
The thing is that the chase rares then didn't have any Pokemon Powers/Abilities and that severely impacted their usefulness. On top of the Shing rule on their cards stating that more than one of it can't be used per deck (you could use EVERY one of those shinings in a deck, but just 1 each. Just like Prism Stars).
We don't have the "1 per deck" here. The Jirachi gives me hope that these will be remotely useful (especially next rotation when the Team Up block rotates and we have it and Scoop Up Net available). But the Rayquaza has me worried that several of the Amazing Rares that we are yet to see are going to APPEAR to have potential, but are marred by weird attack costs that are going to be difficult to fulfill unless you revolve a deck completely around them. Case in point: you need a strategy to get Jirachi to work; you need a strategy to get Rayquaza to work.
The part I'm remotely happy about is that it's not like Shining Legends where most of the Shining Pokemon from that set were vanilla, plain, and largely unusable.
And because there isn't a true "negative limitation" on Amazing rares like the Prism Star and WOTC Shining cards cards. I'm worried that their only gimmick, the weird expensive Energy-asymmetrical attack costs, is going to make them unusable outside of whatever Abilities get attached to them.