yes if they have a card number limit then some cooler cards may run out sooner like maybe 1.5yrs instead of 2yrs and maybe they replace those with other cool cards. Not bad.
Or they have a time limit then maybe those cooler cards have more printed ... but at the benefit of us having a lot of vouchers printed.
One of the interesting parts is that if someone starts to focus on a card in a rarity and gets it to the level they want they start to get addicted to it because then maybe they want to make sure they don't get too many more of that cards because that won't help them build up their other cards. So it is almost a 2yr long voucher sink system once you start. hahaha (Assuming this is your personality style and you have some vouchers burning a hole in your wallet)
Since Soulbound reward cards aren't Soulbound forever, it's not a bad strategy to go after really broken cards and just go after them only until they go out of print. If a reward card is as game breaking as Quora Towershead or Dr Blight, I would go after that reward card only. My guess is if other people see that card getting printed like crazy, they would also FOMO and start going after that reward card too which would just amplify the herd effect. After that card goes out of print, the herd effect would happen again to the next most overpowered card. I'm just guessing though.