The thing with Mesh is that the more nodes are interconnected, the faster the internet will become. This is easier to accomplish in a large city. Also with Mesh you are never queued because it always chooses the optimal available node for connection.
What you're describing is currently only true in the land of spherical cows.
The reality of mesh technology is that it's extremely challenging and as a result underdeveloped.
E.g. up thread I asked for examples, and the primary example is a lora mesh that achieves extremely low bandwidth SMS like messaging.
It's really cool, but it's not "fast internet".
No one has even really started to answer questions like how you can handle malicious mesh nodes in a way that doesn't compromise performance or just require all nodes to be approved.