Why aren't we getting more mergers in Adventure?

Fusions being the differentiating factor of PvZ 3 compared to 1 and 2 is a good idea, but currently it's very difficult to obtain any Blueprint, and the leveling system makes Tier 3 Fusions USELESS!

One way to fix the first problem is by using Tier 2 fusions every 10 levels upon reaching 3 stars, and a Tier 3 fusion in boss battles

The leveling system is a HUGE PROBLEM! Tier 2 and 3 plants become useless, and it's easier to just evolve tier 1 plants.

My solution is to make it harder to level up, but reduce it to 3 levels and only give them abilities.

The Zombie Leveling System is also a HUGE PROBLEM!! The zombies get too strong, forcing us to grind 

like robots to evolve Tier 1 plants, which makes the game EXTREMELY BORING.

The solution is to remove the leveling system and bring back the general buffs from the first beta version of Evolved. Each level increases the zombies' strength by 1% in all aspects.

This feedback is VERY IMPORTANT! Because Plants vs. Zombies 3 is a game with a lot of potential for success, but these problems DESTROY the player experience, as they ruined a good part of mine!