There are certainly lots of lessons in this.
SE30 had a placeholder in their rules for a year that a dyno rule was coming. This year, 170 RWHP cars showed up, which kept a lot of guys home for Nationals. A well intentioned, but late rule change finished the rest for this year.
I personally favor simple, specific, and equal rules to sliding scales and adjustments. I do understanding their intentions in balancing a fairly wide range HP's, but it adds complexity. Hopefully they can sort out the best option for those guys moving forward, and make next year better.