I completely respect your view. And as you noted, our views differ, which is what makes life so interesting.
I have zero hesitation to modify, customize, alter, or otherwise destroy anything I own. Afterall it is mine and I've never been one to care for what others think of my things. And I have zero interest in what happens to it after I own it or after I'm dead. Maybe you could think of it as making history rather than preserving it?
However I totally understand your perspective and frankly I'm glad there are people like you that do keep some things as they were. It would be a very weird world if everyone made everything their own. But maybe that could also be a good thing? Who knows.
I will say there are some vehicles that I think are actually more appealing in stock original form (but very few). With all due respect to the members here, I don't find the X1/9 to be one of them. I really do not care for the X as it was from the factory, both in terms styling and the mechanical aspects. However I feel it has excellent potential to be made into a fantastic car, something not many cars are capable of.