I am a former senior web developer and head of a web-based software company, I know how to use the internet. That is not why I use apps. I use apps because they fit into my phone's ecosystem much better than websites. The flow I've illustrated is the most commonly adopted, as others in the reply thread have pointed out.
I'm new here, and new to federated applications (and fit OP's description perfectly). This federated stuff is going to remain niche unless somebody figures out a way to make it approachable.
Reddit first time:
Lemmy first time: