Being a full mesh means an immense overhead, so well... You can't get much performances it you can't give immense bandwidth under the mesh. Though being able to exchange textual messages at a sufficient speed without any centralized infra is VERY important. In case of a real disaster we will been able to communicate at distance anyway and that's extremely valuable. The real point today is how to spread such paradigm to give enough people the ability to emergency comms.

The other critical battle is on another field: makes most people understand the opportunity and necessity of transforming the ISP's little router-server into one's own FLOSS home server with a set of services to reduce dependence on the giants, collecting one's own emails there, personal online backups of one's data/systems, to be paired with an offline one manually connected to the "central point" homeserver every evening or week, having one's own photos, contacts, ... on one's own hardware without needing GAFAM and so on.

We have for example, Umbrel, Start9, Univention, ... which more or less offer an "easy" solution; we have a certain popularity of commercial NAS units, unfortunately not exactly FLOSS and often in violation of the GPL, but we still don't have a general understanding of what can be done and how important it is to do it, starting from one's own domain name, to be citizens of the web just as one is with a postal address in the physical world.