I will have to agree with this. I have tons of laptops. I never get rid of my older ones and try, where possible, to maintain them myself. On many occasions, that involves taking out the bottom panel as that’s where most of my problems are (power supply, HDD, battery etc).
If you have the right tools (and any IT shop should), I don’t think there’s any reason to scratch the laptop anywhere. I’ve also taken my computers to repair centers on many occasions, and I’ve never had them damaged in any way, functionally or aesthetically.
I too would be upset if this happened to me.