Replacing the basic attack characteristics of robots

In the "replace base attack stat" mechanic you noticed, there's actually usually no direct conversion of hero damage to robot damage. A decrease in a character's damage when leveling up a companion is often due to the fact that the balance of power is redistributed due to a change in reinforcement priorities or hidden attack properties.

In practice, it looks like this: players have been pumping resources into the hero for decades, but some robots at the maximum (red) rank receive abilities that change the logic of battle. For example, they start doing a percentage of the enemy's maximum health (like the Jollyhoof robot) (Jolly Snowhoof) instead of a fixed one. Developers, fearing an imbalance, can deliberately or programmatically “underestimate” the hero’s contribution so that a super-strong robot does not kill everything instantly.