I don't complain because it's just a game, but here's how the rewards experience was to me.
Before the changes, I could complete 2 quests in a single game and get, like, 80 or 90 gold. I could play another game, complete the third quest, and end up with around 120 gold in less than an hour.
I am a player that will never grind. I will never play more than an hour a day. For the amount of time that I am willing to invest, I get nearly ZERO gold a day on average. Completing quests gives me points instead, which are abstract to me because I'm not invested in the rewards track.
Also, my favorite game mode is arena, so I would rather get gold than packs. If packs are a part of the rewards system (which I think is the case, but I'm not totally sure), then I am getting less of the rewards that I want to play the game mode that I prefer. I can't turn packs into arena runs.
Now I play less than an hour a week because I just don't have any motivation. I'm not complaining, but there is definitely something wrong here when it comes to players like me. They catered to players like you, and that's fine, but keep in mind that there are other types of players. With the old system, both of us could enjoy the rewards. Nowadays, I don't think that's the case.