I would say that it allways depends on a watch, and on a watchmaker who services the watch.
I would not send them a watch with Tritium lume, if i was concerned about preserving Tritium dial. But the watch of the OP neither has Tritium Markers on the dial, nor the hands. Therefore i dont think they would mess with those.
Case polishing, yes, they will probably refinish it, so if this is a consern then yes, dont send it to them. But in some cases they also dont refinish, when asked, so its not allways the case.
I only had experience with Service Center in Bienne, and they did a perfect job on my vintage Seamaster Cosmic.
They were also very generous on movement parts.
Your statement was pretty bold "They’ll ruin it.", i say that i dont agree with you and that it very much depends on a watch.
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