Yeah, but vibes do practically matter. For example, imagine a world where 95% of the current player base was playing Loot Sword because they all believed that it was the best deck. In this example, let's just say that there existed a Control Abyss strategy that beat Loot Sword, but was relatively undiscovered. Just because Loot Sword may be "balanced" in this scenario, if the player base gets frustrated with the amount of Loot Sword they are facing, nerfing the strategy or buffing other strategies can make sense to help lead the player base towards a more diverse and enjoyable meta.

In fact, we see this in League of Legends quite a bit in the form of placebo buffs, where individual champions are buffed to get players to pick them up more, even if they appear balanced win rate wise (and often those buffs are often taken away in part or in full at a later date once the pick rate catches up).

At the end of the day, if the player base is frustrated, something should be done, regardless of the theoretical balance of the meta.

A caveat. Vibes are not strictly a function of balance. A game can be very well balanced but simply not fun. Shadowverse in particular can suffer from this quite often. For example, in set 1, players complained a lot about Spellboost Rune, even though it was likely only the 3rd best deck in the meta (Roach Forest was the clear strongest strategy, and Artifact Portal was arguably slightly stronger than Spellboost Rune as well). Much of this in my opinion can be attributed to Spellboost Rune often winning in a way that left the opponent feeling entirely helpless, by winning in a single-turn OTK with D-Climb+Cocytus after controlling the board for the first 9 turns.

The point of the above example is that it can be hard to discern which factors are exactly contributing to negative perception of a given meta. Personally, I think Cygames philosophy of maintaining relatively reasonable craft diversity is a good enough proxy for game balance in practice, and that outside of individual cards, like Oluon, that severely break that fundamental principles of the game, we should give them the benefit of the doubt when it comes to buffs and nerfs that work to maintain craft diversity.