For collectors i Recommend the Ame Spot card in Blooming Radiance in case she drops out of being an affiliate so it never gets a reprint and the Signed Kiara and Suisei cards in the same BoosterI just collect cards rather than actively play TCGs for the most part so I'm content just to buy packs and enjoy the pretty card art as and when they're available,
I imagine since the JP game had a head start they're kind of in a damned if you do, damned if you don't situation with localising it. They either have to skip stuff, release everything in order and piss off international players who're having to wait longer, or do the thing Pokémon does where the EN sets are awkward mish-mashes of multiple JP sets.
This is common among JP card games and the biggest offender is YGO with Konami releasing the OCG in 1999 Japan but the TCG in 2002 for America and Europe so Asian players just dominated World Championships due to being 3 years ahead for nearly two decades until now when westerners finally are able to fairly compete with themI don't think the EN side is ever gonna see much comp play, simply because of how much smaller and more niche it is.
Japan could possibly but that's to be seen if it does survive the two year phase.
The sheer profitability of this does however indicate that Cover will keep making cards until the day they go out of business though.
Holo JP OCG will be 10 months ahead of EN so we will have to wait and see how it goes
This is the current Tier List in Japan if you want to be competitive i suggest getting Kanata and Suisei cards, the Indonesian girls cards are also a good investement for the future when they receive the Ollie Support