I dont understand. Arena has the same rewards as before as far as I know. Getting gold to have some backup resources for it is easy, especially at the start of the reward track.
If you are a good player, you can still go infinite, just like in the old system.
Imagine if you're a new player, just starting out. You dont want to spend money yet cuz you're still trying out the game, so you play arena to grind packs, as every f2p should. You're not very good at it cuz you're noob, so most of your runs dont give you the 150g back. After spending all your initial gold, you must grind lvls in the battle pass. It takes FOREVER, so you play arena less and less often, and still you havent earned nearly enough to build the deck you want, so what do you do? Spend real money or quit the game.
If even veterans cant always go infinite e grind in arena, what about the new players? Forget arena, the whole game can die if they keep treating f2p players like this.
Yeah, it's a shame. In the old system even if you weren't the best player you could play arena every two days. Now, it's possible that you can only play once a week in the later stages of the system. It encourages spending money and that's bad. Now, if the mediocre players can't effort arena only the good will remain and the skill ceiling will rise again. Making it even more difficult to achieve higher wins. It's a loss for everyone.