I’m staying w/ Rotax in the Masters class. Hopefully, they stick to their past history and the new changes improve ease-of-use, consistency and reliability but leave performance the same. Nonetheless, I think the upgrades will be consistently faster than w/o but the old setup could be setup just as fast but just harder to do.
On the other hand, the cost of the upgrades seems reasonable, so why fight it? It’s less than 2 sets of tires.