Some of the visual mods can be performance enhancing as well. Such as drilling the brakes or onther parts for less weight and wet stopping improvement.
I can see where your coming from though.
Over the years my bike has had many modificatios done.
The suspension has been changed to progressive fork springs and a fork brace to stiffen up the front end. Forks have been raised in the trees.
The rear shocks were switched to Koni dial-a-rides, as the stock rears don't last long.
My engine has had a rebore, porting work, competition 3 angle valve job, 4 into 1 exhaust & an oil cooler added. Also over the years have had swaps between points and electronic ignitions a few times for various reasons, including a Dyna system that fried after 8 years. I will be attempting a swap to a later model electronic again this Winter.
I did what is refered to as the WG coil wire mod, which essentially wires the coils dirrectly to the battery, giving a solid 12+ volts to the coils, using an automotive relay to fire them, thus by-passing the Ign. switch and kill switch and related wiring, which all causes loss of power to the coils.
My air box has been modified to allow more air to enter by adding holes to the stock air box. I did use Pod air filters for many years, but switched back to a stock air box because of problems with wet wether and gusts of wind.
I added the Rickman fairing and chin scoop to give an aerodynamic advantage and visual bling.
This Winter I will be concentrating on my rear end. I will be rebuilding the Konis with new seals and springs, as one is leaking 20 years later. I will also be swapping to a stock length (don't want a longer, slower steering) custom made, braced swingarm.
Also will (I hope) be adding a solo seat (H2R fiberglass) seat.
Changes seem to be an on going thing.
Here's a wiring diagram showing how the WG coil wiring mod is done: