I have just under 20 SxS, all acquired in the last 10 years or so. There are only three that that I wouldn't modify, none that I wouldn't "maintain" in the English sense.
As Gunsaholic just said, I rather spend my time afield with something that I love the way it looks, so I have zero issues with ensuring all aspects of the gun are well maintained. That is separate from modifying the gun (a permanent change)
The three I won't modify are an extremely high condition Tolley, a unique and high grade Ideal, which CJO is currently "maintaining" and my previously restored great grandfather's Fox A grade.
But having said that, the more I learn about my guns, the less inclined I am to want to modify them. I usually like them as they were originally made.