We need, and have, a mostly centralized system of government
     underpinning, agreed upon law system, economics (largely), science,
     knowledge, etc.  Generally, that allows us to operate very
     autonomously and in a decentralized way already.  I seldom see,
     visit, or interact with the Federal, State, or even local
     government.  I usually interact with regulations only as constraints
     on my decisions and others.  Besides paying taxes and benefiting
     from fixed roads, limits to hazards, etc., I feel very decentralized
     and self-controlled most of the time.  You're arguing that
     disassembling that centralized / decentralized system into something
     more purely decentralized would be better.  I don't see it.

   first, you state that you rarely interact with distinctly
   Federal(centralized) entities. ok, i agree :)

   second, you state that these centralized norms "allows us to operate
   very autonomously and in a decentralized way already". ok.

   then, "Besides paying taxes and benefiting from fixed roads, limits to
   hazards, etc., I feel very decentralized". you're speaking to shared
   infrastructure. again, this is not a uniquely centralized capability.
   in fact, decentralized infrastructure is more robust!

   understand that decentralized consensus can lead to global
   coordination. not only that, but this global coordination is resistant
   to singular abuse! e.g. these patterns are resilient.

   it follows that the benefits you don't see in decentralized structures
   are actually the end to which you aim and strive for!

     Efficiency.  Trying to create, maintain, and evolve many, many
     decentralized systems at the pace our centralized legal /
     information / economic / medicine / scientific / safety / defense
     system operates would be far less efficient than the system we have
     now.

   efficiency used to be an adequate excuse. this is why i say that
   communication is the key to modern decentralization.

   we aren't there yet: but to yield to defeat before we've fought the
   fight is to succumb to despair. don't do it; we're human, after all :)

   best regards.