The answer is: when most of the Gadgets and Star Powers have been developed, those were introduced with fixed values rather than percentage of x based ones since back then Power 9 was the highest you could go.
It's just a huge undertaking adapting more than 70 abilities into the new world. We're working on it though and hope to have (most of them or all) ready for the next update. We wanted to hit the timing for Hypercharge with the return of people from holidays (in Europe and in other areas of the planet where people have vacation around June-August) in order to make the best out of it for the game instead of waiting for this change. The rationale there that introducing Hypercharge earlier has a bigger impact than "fixing" existing abilities which aren't % based.
Of course people can make the argument if that was the right rationale, but if you consider that "QoL" updates don't stop the natural decline of games,...
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