It's done because the dsp files only have a few tables to mod. And every limiter/table you don't have access to would reference the base tune. so you'd want your big tune the base tune so you know you will have all the performance limiters max and mins in check. All for performance reasons
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Makes sense ^^ I know from personal experience the 3 Tuners I have used in the past Tunes all Default to the highest setting.