Yes, this is all addressed in my blog post, including the points where there are the most major re-centralization risks of fediverse.
https://coding.social/blog/grassroots-evolution/
As for the overall situation you can compare with road traffic. Post-facto interop is something like "if my car fits through here, then that's my shortcut", and over time it becomes a busy crossroad point. Is it safe? No. Responsible? No, unsuspecting pedestrians are killed by cars speeding from unexpected directions? Is it efficient? Not at all, all traffic is stuck, everyone honking their horns. The law of the strongest rules supreme: Big SUV's and careless drivers have the advantage. Traffic is like this in some countries. People get used to it, and things become streamlined to an extent in this chaos. But it is far from optimal.
Now take the US as example. Totally car-optimized (app-centric). To the extent it isolates people even.