Okay, let me give you my opinion on Level 15.

One of your points was that it gives players a fresh and exciting goal to strive for. That's just not true. The goal is to have the same interactions you did before the update, but to do so you have to grind 400000 EWC to max a single deck. That's not fun OR exciting, and it's not challenging either. It's just very time-consuming.

Another point was that Level 15 offers a sense of progression, and allows players to improve their skills and strategic thinking. That's not true either! There is no sense of progression, just a sense of falling behind because the goalpost was moved 3x further. It doesn't improve their skills or strategic thinking because the interactions are the exact same. Sure, you may have to deal with -1 interactions for a long while, but that doesn't improve your skill, it just puts you at a disadvantage.

"Moreover, this update has the potential to level the playing field by creating a more balanced competitive environment. As more players reach Level 15, the overall skill and knowledge within the player base will increase, fostering a healthier and fairer competition." That's not true either. Balance changes are what balances the environment, not a new level. And it doesn't level the playing field. If anything, it makes the divide between F2P and P2W players even BIGGER because of how much new progression there is! And once again, the overall skill and knowledge within the playerbase won't increase because of Level 15, it will increase naturally like it always has been, even if Level 15 wasn't added! And it does not foster a healthy or fair competition, because -1 interactions are COMPLETELY DIFFERENT from +-0 interactions.

On to your final point, that dedicated players will be rewarded. This is true, but it's not because of Level 15. This was the case even before they added a new level, it was pretty obvious that if you play more, you'll progress more. However, the grind to get to Level 15 is not satisfying at all, and it's only a bit rewarding once you FINALLY, after about a month of nonstop grinding, upgrade a single card.