It's bold to say users don't want apps when the expressed preferences are so strongly for apps that "App Store" is a well known brand.

The word app is short for application, which in this context is just a synonym for capability. People have tried breaking apps apart into more fine grained capabilities before and it never worked (OpenDoc and OLE being two well known examples). Brand names matter, they have value to people. YouTube isn't an abstract collection of decomposable capabilities, it's a brand that summarizes numerous unarticulated pieces of information, like its commenting culture, what kind of content is allowed and what isn't, etc.

> I'd like to lookup certain words in some of the messages, then perhaps share something relevant from it.

This is already a built-in feature on macOS. If I right click in your message "Look up PerKeep" is literally the first command, and if I click it I get a nice info window telling me what it is that I can copy/paste from. There is nothing to solve here.