instead of waiting months for a reply i will answer:
1. It was a mistake, the nonfoil versions of the cards are already added to the client, only the distribution is missing. I saw the DB_xxx accounts play with the nonfoil versions so the only thing missing is the cards since they are already coded in.
2. You add things nobody asked for, i see foil cards maybe 1/100 matches even less, nobody plays with them since they dont have the same appeal as paper foil cards, nobody buys them since the spread is insane. Worse is you spam them in chests since you upraded the look of them and again nobody asked for this or wants foils.
3. This one i dont know they would be perfectly fine in chests or player rewards but i guess you cant admit you made a mistake.