I agree 100%.
People say it all the time
"R is better on track, S is better on street". How does one quantify "better". At the end of the day, they both suck on the street compared to bikes that are actually designed for the street (Multistrada, Monster, Hypermotard, Diavel, etc). What makes a bike good on the street are things like friendly ergos, lots of leg room, more upright seating position, good wind protection, good fuel mileage, storage space, heated grips, cruise control, no vibration, good mirrors, etc.
A Panigale has none of those. Yes you "can" ride it on the street, you can ride anything on the street. But to argue which one of these bikes is better on the street is silly, especially considering they have the same ergos, fuel economy, lack of storage space, seating position, lack of wind protection, etc. For all intents and purposes, when discussing street riding, they are the same bike. One could make an argument about the S's electronic suspension, but meh. That still doesn't make it a great street bike in the whole scheme of things.
And as far as the track is concerned, I would bet a paycheck that riding a 1299S or an 1199R back to back, 99.9% of the people on this or any forum would put down EXACTLY the same lap times. Any potential being discussed is all theoretical because none of us are capable of extracting all of the available potential out of either one of them. At the end of the day, the rider is always the limiting factor. The idea that if one plans on doing track days or racing they need to get the R is laughable. I am leading and well on my way to wrapping up a couple of Expert Regional Championships on my S.
The Ducati test rider on a 1299S was able to lap around 4secs of the lap times Chaz Davies put down on his full factory 1199R WSBK. And this was while the 1299S was in street trim...mirrors, mudflap, etc...even OEM tires.
So for any mere mortal to say one is "better" or "faster" is arguing semantics. They are both WAY more capable than any of us, myself included.
So at the end of the day, just get whichever one you like better. It honestly doesn't matter.