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Their point is that the current decentralised Bitcoin is functionally unusable and simply not ready for mass use.

In that sense, a truly decentralized Bitcoin that people can actually make use of doesn't exist.

That is definitely not true. As mentioned there is local bitcoins, atms, meetups, bisq, just to name a few options, were you can exchange bitcoin for fiat. The options are there, are used and are even mature.

Centralized exchanges provide a lot more essential facility than fiat to bitcoin conversion. In particular, they provide acceptable transaction fees and acceptably fast transaction turnaround time.

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