I used to work in a library and we all had a similar feeling about books. They were all valuable and to be preserved! Objectively, that's not practical. But that base irrational feeling is still useful and important.
Technically we've missed at least four billion years of gravitational wave events, so a week of shutdown for an upgrade isn't going to make a huge difference to that.
I miss those days four billion years ago, before modern worries and before days.
only for Earthlings. I'm sure (hopefully) someone on a rock around a different star might have had those worries in their day too.
Yes, that's where the practicality comes in. But I'm sure there are people who have FOMO over all that data collection we missed over the last 14 billion years. And that's good! Maybe somebody will come up with something clever that is better than nothing. E.g., all the CMB work: https://en.wikipedia.org/wiki/Cosmic_microwave_background
My crude searching tells me there are ~3 supernovas in our galaxy every century. Miss one now and the next might wait for the next generation of astrophysicist.