It’s also completely unnecessary since there are better devices for tracking and shenanigans available. Why bother with a shaver that has neither a camera or a microphone or is tracking location for anything when you can use a device that has all of that. Like pretty much every modern phone on the market, more so smartphones.
Regarding that other thing… In practice it could be that you are staying in a hotel room for any reason really but you forgot your power brick, still need to shave, but have a PC for one reason or another and a spare cable to use. However unlikely that is, but it’s not unheard of to forget the phone charger when going on a trip.
So… As someone who uses the all feed and that includes finding this post and subsequently interacting with it. There are reasons to use all. I use my subscriptions more as bookmarks to have an easy return path to a community should I feel the need to really check up on that particular community. I then use all to browse for interesting content to read and possibly interact with. I don’t use local because that feed gets stale with things I have already seen very fast and I don’t look at only subscribed feeds because I don’t want it to be an echo chamber of my own preferences.
I block communities that don’t interest me, can’t interact with reasonably anyways or that are simply annoying. As it is I don’t see a problem with using all since it still drives interaction via comments like this one. You can’t really restrict voting either since that creates more issues than it solves. Remember that voting on a post is interaction too even if there is no comment from someone. Perhaps that person is short of time or just doesn’t have anything to add.
At the end of the day it is personal choice how people choose to discover and interact with content.