On Linux, rm can delete empty directories with -d too, not just with -r.
rmdir is the counterpart to mkdir, which creates empty directories, so of course it can only remove empty directories. After all mkdir can’t create full directories either. There however is rmdir -p as a counterpart to mkdir -p, so if there is something in the directory, you can use that, as long as the something is an empty directory.
I had one of those laptops (a PowerBook). Yes, it had two slots that could be used for batteries. But that meant taking out the CD drive. Modern laptops don’t have that anymore so I’m not sure where the room for another battery would come from. The other thing is, it lasted at best 4-5 hours on one battery when doing light work. Its modern counterparts last 10-15 hours on one battery.
The same thing actually happened with phones. But now we literally can’t spend half a minute not looking at them and we also play energy hungry games on them etc. You can still get a phone with replaceable battery though, e.g. Fairphone or Volla.
I tried it and it’s way off for me because it gives too much weight to submitted posts. I don’t have very many submissions so even when I selected recent only, it focused on one guide post for a game I wrote many years ago and made the profile 80% about that. But I guess that’s a problem at some point before the LLM is involved. There are some other similarly non-LLM problems too like making the most used terms section list almost only subreddit names.
When I limited it to recent comments only it did a better job. It even listed “Humanity’s general incompetence” as the fifth of my “top 3” topics.