But I still like the unix motto, about doing one thing well

I prefer this because it does give me more (<_< , >_> , <_<) liberty to choose what my devices do. I want to control my computers. For my phone, I avoid many apps because I don't their company to have my personal information, or because I don't trust them. I consider having banking apps on my phone to be a risk I don't want to take. It also seems like bundling could have security implications, such as having a messaging app and finance app so interconnected that a flaw in one could facilitate access to the other (but I do say that naively, this is not security advice or insight).

We also see a lot of people saying "I don't use Facebook, but I just have [Facebook Messenger/Marketplace]", so there is a very real-world case where people don't want the whole package bundled.

But I certainly acknowledge the downsides of this. I abandoned Debian partly due to outdated apps, but also partly because my disparate preferences created a Frankensteinian mess which didn't have the smooth interoperability of a DE-centres OS (like Ubuntu-flavours or Mint) or the interoperability we see in that video, where the map is connected smoothly to the ride hire. I can see the metaphor of the collectivism/individialism dichotomy at play there too.