I think that part of the issue with negative comments may have to do with familiarity with the aesthetics of the previous model. If you are used to how the MY2015 looked, then the 718 Spyder strikes a dissonant cord.
I for one had no clue what the MY2015 looked like until I started reading this thread. I Googled it, along with the 718 and put them side by side to see the differences. Being used to the MY2018 718CS I drive, I saw nothing wrong with the new Spyder, the old Spyder looked a bit bland in the back (ok, the front too, I like the aggressive front of the 718 Spyder).
Now, this maybe heresy to someone that is familiar and loves the 2015 Spyder. Well,... peace!
The flying buttresses on the cloth top is another matter.Aesthetically, I couldn't care less. But these suckers are going to flutter in the wind like you won't believe.
I used to have a sailboat in the Med with an awning with similar pieces (for sun protection in the cockpit). Thankfully they were mounted with zippers, so, around 20 knots wind, I would zip them off, before they drove me nuts. The awning itself was rolled up on its frame, around 30-35 knots, which was rare.