I think the current 10X is simply too expensive, such that very few cards will be unlocked, very little dec will be burned, and players will mostly find themselves in one of two positions:

• they don't have their cards at the level they wanted, or
• they've earned more cards than they need and they have excess cards that simply aren't useful to them unless they burn them for a fraction of the glint they spent to acquire them.

Reasons I can see people like the 10x multiplier:

• doesn't risk any pressure on the floor price of cards
• doesn't interfere with the total PP of land

However I think that in a tradeable card game, players want to be able to swap and trade cards around to complete their sets and it's just very expensive to do so at 10x - especially for players that collect and play gold foil brawls, where RNG has such a signficant effect on the ability to get specific cards.

I still believe that a similar effect could be achieved at a lower multiplier, like 3-4x, which would still prevent a flood of cards unlocked (since they will be more expensive than any other cards from the same CL set) while not being unobtainable for most players.