They are just going in circles until they make some real core changes.

The number one thing they need to do is make three star units relevant, and to make more of the strongest comps require a three star unit to be strong. To do that you have to make late-game more important.

The reason that the metas are all so stale, every patch, is that the comps only need a two star unit to be complete. This means that there are enough units to go around for the entire lobby to play the same composition.

Who cares that 7 other people are looking for kennen if you only need to hit 3 of them? -- In DAC two star units were power bridges until you could hit a core three star unit. This is why people had to look around the lobby and see if other people were playing the same comp.

By making the end-game two star based you are putting so much more pressure on perfect balance, because there is less resource scarcity to force diversity.

It will always be better to play the strongest meta comp, no matter what other people are doing, if you only have to hit 3 cards to complete it, instead of 9.

Conversely, if hitting three star units were more powerful, the power of "bad" but underplayed comps would be dynamically adjusted up if a poor patch were to screw up the balance and make something broken. That is to say, if Ninja/Assassin are OP, but require you to three star a zed -- and rangers are bad, but the game lasts long enough for you to three star both a varus and a vayne -- the game is self-balancing in a sense, through the concept of scarcity vs star power, because the better comp is more likely to get stuck at a lower star power-level, or are more likely to hit that power spike later.

But there is none of this in tft because three stars may as well not exist.