Wayne,
In answer to your question: because hybrids will no longer be fuel economy vehicles. They will be economical alternatives to non-hybrids. That's the demand of the market.
The power display shows things after they happen - yes - but there are also signs that things are about to happen. For instance, during full acceleration all arrows point into the tires. Press less, the engine remains on with no arrows from the battery. Less yet, the engine on while charging the batter. Then, just the battery runs the car. Keep going, and you're "deadbanding" without arrows. Lastly, the battery gets charged.
So, everything you see has already happened. However, by knowing the "steps" you can predict how long it will be before something changes and adjust accordingly.
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