Some bizarre comments here.... I haven't seem any of these issues on my Gen 4. At all.
That said.... life conspires this past year to not let me ride the bike like I want to.... only managed 6000 miles to date. So if this is something that takes time to "develop", perhaps I haven't seen it yet.
My speculation is that that isn't the case - regardless, I've experienced no shifting issues of any type.
IMO, the Gen-4's six speed transmission has (for me) changed the character of the bike to a noteworthy degree. Various mountain grades, sweepers, and tighter twisties that I've ridden a gajillion times over the past on 3 different 5-speed FJRs, is simply a different experience on the Gen 4. Depending upon the incline, sweeper or corner; I frequently find that I have to use a different gear, or rev setting (or both) than I would on the Gen 1-3 bikes. Bit of a learning experience, but not a huge screaming deal.
The 6-speed, slipper clutch, and LED lighting are what makes the Gen 4 truly stand out.
We still have one of the finest sport-touring chassis on the planet. We always have had this.