Its a genius move that keeps all the flashy booster fun Wizards thinks we want, while also pulling back the scale and remembering why we all loved those early Eldraine, Theros, and Ikoria frames so much
The main reason for this is that a lot of the older MTG formats, namely Modern and Legacy, use cards that dont cost much mana
According to Wizards, you have a 1 in 3 chance of opening a nonfoil FCA in Play Boosters, with a 63.25% for that card to be uncommon, 29.75% to be rare, and 7% to be foil
And yes, for those who are unsure, that is Liliana in the art getting her "contract" (the full-body tattoos)
The rate lined up exceedingly well against the popular removal in the format at the time (Push, Bolt, Path lol )