Expanded could no longer be played in the digital space and, considering that some cards were already pretty difficult to get due to their longevity, I think Pokmon thought it was a much safer bet to just focus their attention on Standard and see how the game recovered from a global pandemic
Tiaramisus ability allows it to shuffle your own Madolche cards from the graveyard to shuffle that same number of cards from your opponents field, with additional advantage offered when cards like Madolche Ticket, Salon and Chateau
In terms of the clash pack, not a compelling reason to pick it up
Note that like many other PKs, they have a ton of synergy of power-smashing effects that will kill pretty quickly
Dividers and labels make navigation much easier as the volume grows
You can use it to chain an extra turn spell or two, and overloading this leads to a quick win