My priority is to purchase a game that is in decent cosmetic shape and that has not been hacked. Then I clean top side up and do a very detailed mechanical restore- throw it in the game room and play it!
I like games to look like they are from whenever they were built. It drives me a little crazy to see bright white art work and bright white drop targets on a game thats got a beautiful patina. I rotate my playing games through the shop and do complete cosmetic restorations and clear coat etc etc with the aim of restoring everything to better than new- but I KEEP all colors as they are with the patina!!
To me- I prefer a restored game thats all color matched to what was there over one that had a drop in new CPR playfield and plastics and new bright paint on the cabinet- it just doesnt look like its from the right era- almost a mash up of new and old that I prefer to avoid.
However- I only purchase games that are candidates for this process. If I had a bleached out example than sure- CPR away and it would look amazing and far far better. Just saying I prefer the patina. Authentic!