Pretty much agree with tree. I will just add that mindgating is more important for the weaker elements. However, I think the weaker elements benefit a lot more from upgrades compared to the stronger elements. I think an increase in the number of upgrades will help make the weaker elements slightly more competitive.
But tbh, in war, life is the only element that I would consider "weak". Earth, gravity, light, water, air, and time have all had success in recent wars, but been subjected to poor RNG or failed mind gates. Life is the only element that hasn't established itself as competitive. I think a part of that is a lack of a veteran leader and active team members. Given the element's history, I can appreciate the difficulty to recruit a good team. But life is capable of beating any deck from any element. This is true of all elements, it's just easier for some.