Likewise, while cryptocurrencies offer the promise of revolutionizing traditional financial systems,
Talk directly about bitcoins, not cryptocurrency in general.
Bitcoin does not just promise revolutionizing the traditional financial system, bitcoins is already doing it.
their current level of adoption for practical use remains a matter of contention.
It is still a matter of contention because of how some people have adopted and accepted the opinion of the most governments and some other individuals about bitcoins. There will be more practical usage for bitcoins when it becomes accepted by the people who are pushing the false narrative of it's unreliable nature.