Not a big fan of the 200+ card sets and how they lead to card price volatility. Getting a specific card becomes highly improbable via buying boosters, so the fallback becomes buying it on TCGPlayer, which is perfectly fine by itself. But if that card is popular in the Meta, the card instantly becomes expensive (Supply and Demand 101.) Ahem, Jirachi.
Fairie Alolan Ninetales GX is a pointed example - the Full Art shot up to $40+ within weeks of release ... only to crash to $20 (as of now, and dropping) as Jirachi in the very next set mostly replaced FAN GX in the Meta. The regular GX also has volatile numbers.
Two bad results with the 200+ card sets:
1. paying $40 for any card, or anything more than $20. Some of us have kids, who like to play Rayquaza and CakePop - Argh.
2. paying that much (or trading) for a card that plummets in price a few months later when the next set comes out.