Hi,
I always played Mtg with friends, so we had a smaller card base to work with. I'm having trouble wrapping my head around the concept.
Decks are usually made to perform some work: Mill cards, destroy Creatures, shuffle the hand of the player, etc. The structure of the decks in keyforge, even with the algotithim, will group cards that perform some kind of combo. So, once you figure out what that deck it's supposed to achieve, you already know if it will be achievable or not.
For example: let's say the deck whole combo is based around a creature and some power-ups. If the creature is destoyed, and if the deck have no way to ressurect it, the deck is crippled. the rest of the synergies don't work, and you never could prevent it, because you can't deckbuild.
If you play with friends, and each have a deck, in the case one deck may be consistently stronger than the other. You will keep losing, and will be forced to buy another deck.
Also, the feeling that "this deck could be awesome if only that card was here..." will be consistent.
I see the appeal of fixed decks. But also see the problems that the system will bring. Lcg's couldn't fix the power creep, but this solution is equally inneficient.
Sorry for the grammar