Less than the tires analogy it is more like replacing the factory wheels and tires. If the new ones are complementary then its fine, if they took off something factory and added pink painted wrong sized wheels then no. The beauty is in the eye of the buyer.
Virtuoso, cleaner then polish. Remove hardware and clean as desired. Remember if your guitar is shiny then the hardware should be somewhat less dull as you care. Otherwise beat the crap out of it and make it your own relic.
you need this as you have not mentioned weight
These are from the guy that makes straps for Carlos Santana who has a bad shoulder.
Also make straps for Dr. Billy Gibbons the right Reverend.