They try to make a better car without using parts from RRR... I think.
Some part like transmition sould not have changed. RRR transmition is one of the best touring transmitions.
Everybody grumbling because of the big differential at RRR. Now grumbling because are very small on R4.
Car is in development. hope after the summer have made improvements to make the car better.
Kyosho is a very seriοus company. I think they never release something that would be worst than the older version.
Cars now pass to the next level and need development ... Also need a lot of practice for the serious racers to find what car need to go faster.
Before R4 i race with a Shimo edition RRR. I run with RRR 3 years. This year before release of R4, every race, i made a new track record in my country. (after 3 years of practice.....)
It's to early to compare R4 with RRR or other cars.