I don't mean that the power pool is obsolete, but akin to the development of your power in quality, there is also the scope of what you can do with the power pool you have. There was a novel or comic where the MC had the power of temperature control, where he had shit mana/power pool, but alongside his quality improvement, the more his mana/power pool, the more stuff he could do, like control the temperature of a person and kill them instantly, but he didn't need that much mana/power pool to do that. The biggest change came from a paradigm shift in how he viewed his "thrash" power.
Tiffany's power is busted, and it's not given the proper justice it deserves, to be honest.
In this context it's a good parallel. After all Level 1 MC has a lot of trouble making small amounts of steel, but he could always create his jacket buttons without even thinking about it.
In any case, we need a theory that can explain the following.
1. Output
2. Efficiency
3. Pool and Replenishment
4. Interactions and Contests.
5. State and transformation.
Output is fairly simple. The more power you have, the more you can output.
Efficiency is a bit odd. We know that it exists as a concept, but it doesn't seem to be related to Power or training. Instead it's related to.. connection. The main theme behind Evolution Trances is that the Superhumans can output way more than they should due to efficiency.
Pool seems straightforward. The more power you have, the bigger your pool. How you gain back that energy though is a mystery. For example MC at some point says that as long as he fights low class monsters, he can keep up practically indefinitely. Then we have Alice who thanks to Clark's power she could replenish her power reserves to throw more bombs, but it was a trickle instead of being able to capitalize on the extreme power housed in her arm.
The Power contests are a nightmare. The obvious example here is Ella vs Duncan but there are more, like how could Jake affect Laurie so completely when they had the same Power. Also how the Jake vs MC fight played out, where MC claims that Jake's commands are efficient compared to his fighting style.
State and transformation have to do with the higher evolutions. How Power affects and strengthens the body or how Kira and Elijah could use their reserves to control their movement.
I'm certain that not all of those are attributed directly to Power and connection probably plays some role, along with the evolution level. The exact system though remains a mystery.
As for Tiffany, 100% agreed. She is indeed busted. I've been vocal about this.