Got the cardback. Won't be touching the reward book for the frame. Just the thought of having play another 6 matches in one of the shittiest seasonal metas ever is enough to kill what's left of my enthusiasm for Gwent.
Unfortunately these people form a problem that's impossible to fix. Try hard/troll mentality is why besides Gwent I generally don't bother with online modes whatsoever.
The only thing I can say about it is I wish they'd keep the achievement/goal oriented gameplay (win *X* amount of rounds etc.) for ranked mode.
Gwent pretty much encourages it with the ability to download these decks to your library. The hardest part, if you've got the cards needed, is scrolling through all the try-hard reposts of the deck. As for rewards, yeah the old two-tier rewards for casual and ranked did seem to work better. Plenty of other games use similar to give more incentive for competitive players to play in those queues than curb-stomping everyone in casual.
Right now, 50% of my seasonal games against Nilfgaard and the other 50% against beginners, who just don't have enough scraps to craft Damien.
The solution is simple, developers should add approved pre-made decks to choose from in the Seasonal games.
It will be even more fun if the cards will have abilities that are not in the main game, like Thronebreaker cards.
After tonight, I'm really struggling to see what's so great about Gwent's gameplay. NR boost'n'ping spam decks seem to drive themselves with little input from the player. NG Damien decks are painful no matter how skilled the player is at sequencing steps. Good and bad players hit the rope every turn once they get to the pick units up stage. ST self-drives with harmony, leaving the choice of what to poison to the player. SK, SY and MO are hardly seen in this seasonal.
The only problem I can see with your idea is that CDPR abandoned a similar idea with the old seasonal challenges mode. If you played during open beta, you might remember the holiday event puzzle modes, which were similar to what you see in Thronebreaker. Moving into HC, CDPR said they wouldn't continue them, as it was too time consuming for them to code essentially new cards for those events. Unless CDPR has had a change of heart, then the middle ground would be for them to have preconstructed decks from the existing pool. That said, they could always release a set similar to MTG's 'Unhinged' series - a set of cards with offbeat abilities and only legal in casual and seasonal modes.