Many ask why do we need so many blockchains and cryptocurrencies? The obvious answer is resiliency.
Alternative answers include choices/options and market needs.
Why are there so many brands of toothpaste? Why were there so many brands of cars during the 1950s? For both products, the obvious answers are also options and market needs.
Just as there is a market for people who have sensitive teeth, there is a market for people who desire black light-bright teeth.
Just as there is a market for people who can afford Rolls-Royce and Ferrari, there is a market for people who could only afford Studebaker and Ford.
Despite its origins as a military communications network, the Internet was decentralized so that communications could take place in the event of a nuclear first strike. If a normal route was knocked out, the message would be re-routed to a channel which survived the strike. Today, if an EMP takes out Facebook, that's it for people using Facebook.
Decentralization is still needed in as many areas as possible.
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