I was one for 100% stock, however after spending time in my car over the past 4+ years, it became apparent that I need to modify for better performance, ride, looks, etc. My rule is bolt on parts only where stock car can be returned to 100% stock condition. If a stock part is to be refinished, buy another stock part and modify that piece while bubble wrapping the original part.
Some modifications are hideous and some are tasteful. The owner of a car can do with it what they want, but the execution of their vision is subjected to the masses court of appeal. If what they did *****, then it *****. That car with the big wing *****.
There are certain cars you just do not modify though. 1992s, 1998 GTSRs, etc., etc. To do so is s slap in the face for fanatics. To each their own I guess, but I do like the stock look of the Viper over the years and the factory rim choices are pretty good all considered. However someone putting on Motons or a Paxton or an 08-10 Hood. I have absolutely no issue with that. Just keep the original items with the cars along their life.