Because I have no interest in them, or they are NSFW and don't tag properly, or they are duplicates with ones I already follow (technology communities are a good example)
I personally follow all the technology communities and just show new subscribed content on my main page. Some content is the same but there's a lot of different posts too.
It kind of sucks that there's several sub's with a lot of people but then again, that's the point, right?
Hm, I'm afraid at this moment the most common solution is https://github.com/CMahaff/lasim, which requires a computer.
Would you be able to get access to one at some point later?
LASIM author here - it should! Though Mac OS X is the one platform I can't test on myself - I can build it through Github, and everything I did should be cross-platform, but I can't actually launch it myself to make sure everything is working fine.
Only other thing might be if their work Macbook imposes any restrictions on running arbitrary binaries from the internet - which it understandably might.