Aerodynamics is pretty complex topic to really have conversations about due to basically all the reasons listed in this video. Fluid flow is just a bit of a pain to describe and understand when the system is rather dynamic, such as a car going around a track. Pressure fluctuations and turbulence practically ensure that at any one time, the flow around something like a Verus wing is not like an ideal streamline CFD screenshot. CFD and flow visualization are still crucial to designing and optimizing modern components, but with any simulation, you ultimately have to try to verify and validate design characteristics with experiments to ensure you have minimized distortions.

another way of analogizing it is

looking at flowvis from a lap around the track is like looking at the avg speed around the track for a lap, or even the raw line used for that lap (with no other data). it's neat to look at, but that doesn't inform which corner, braking zone, or straight the gains are being made and how they're being made (less drag, more downforce, combination of them, center of pressure location and/or aero balance, wing efficiency in yaw, etc)

something that always confuses laypeople is the idea of a car with slightly lower "peak downforce" having a faster laptime that a car with more peak downforce

Finally, I get it!  Thankyou.
What about a pressure membrane with hundreds of tiny sensors for live data (on track) linked to a computer in the car for each wing profile?  Tilt adjustment?

Aero novice here, would a dimpled underside wing skin or the addition of underside vortex generators offer much benefit?

Flow vis will trick you. It's only giving you a time average of the wall conditions. The boundary layer is different to the bulk flow field, unless it's fully turbulent.