I agree with this. Unfortunately in North America all the series don’t just want entry fees but they also want the profits from tires, engine importing etc. I think the sport would be much healthier if promotors stuck to promoting races, the ASN’s stuck to enforcing rules and class structures and teams stuck to developing drivers and making karts go fast. Switching to multi-manufacturer engine classes (such as OK-N) would allow the teams, engine builders or drivers to pick which engine they run instead of being forced into something by the series they are close too.
The sealed engine formula has only for years benefitted the biggest or richest teams/engine builders by buying parts in bulk and building just a few rocket ships from hundreds or thousands of parts and thus enriched the series promotors by creating an arms race.