The PC screen going blank or the whole machine going into standby after a ridiculously short time. I know you can adjust this to longer periods in the settings, and I can understand the reasons for it, but really it's all back to front: you should have to actually opt to have your PC screen blank out etc, rather than have to opt out. Not that you can really 'opt out' at all, rather just extend the intervals.
Plus, it's not very difficult to adjust the setting in Windows, but it can be a lot more awkward and time consuming in some Linux distros.
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On a mountain range
I'm Doctor Strange