The arena change is a nerf for some and a buff for others.
If you're a newer F2P player, then random packs are probably better. If Arena only rewarded TGT packs, or only rewarded classic packs, then you would have to find alternative methods to acquiring packs because arena can only possibly fill out a single set for you.
The current solution is worse for long term players who already have most everything they need from classic/gvg.
I think the best solution would be to provide a token that allows you to buy whatever pack you want, but perhaps that's exploitable in some way.
If you're a newer F2P player, then random packs are probably better. If Arena only rewarded TGT packs, or only rewarded classic packs, then you would have to find alternative methods to acquiring packs because arena can only possibly fill out a single set for you.
The current solution is worse for long term players who already have most everything they need from classic/gvg.
I think the best solution would be to provide a token that allows you to buy whatever pack you want, but perhaps that's exploitable in some way.