What do others think about this, and the 22nd century notion?
Well, the curved pylons make a new sort of sense from the ENT viewpoint, being half a warp ring - Earth-style nacelles apparently make up for the other half.
But surely there should be "Vulcan influence" in basically all starship designs anyway?
Influence sure, but the way I choose to interpret it, this is from the Federation's second generation of starship design. While most of the early Fed & SF ships would still be mostly designed built by the individual member worlds just to keep up the numbers, the second wave stuff would have started to show increased hybridization both in terms of technology and aesthetics. Later designs would be increasingly homogenized, but in this transitional phase you could still see strong a cultural
aesthetic at play.