So why should I care?
I don't believe you - you obviously don't know how to use the notes app.
How can one possibly not know how to scroll through the notes app?
I type incredibly long notes, and then add to them daily. I experienced no problems on previous iPhones when doing the same. Scrolling down long pages causes the 6+ to stutter like no iPhone before it.
The 6+ lags, and both flavours of the iPhone 6 have insufficient RAM for all but the light user. Those are facts I'm afraid.
However, only heavy users encounter these problems and from there it's a subjective thing as to how much these issues bother them. One guy in the 6+ lag threads returned his phone for a refund. He tried several and they all lagged too much for him to put up with.
Others like me hate the lag and especially hate the tab reloading, but we suffer it because of the iPhone's (other) strengths. If you claim to see none of these faults due either to your usage pattern or how accepting you are, then fair play.