international remunerations and payment censorship avoidance in tyrannical regimes are two obvious and virtually unarguable problems a genuine cryptocurrency solves
Now you might consider that ethical (eg in totalitarian regimes). I make no judgement about that. But the fact remains the use case is avoiding the law and that has negative implications too (eg ransomware, funding various illegal activities).
and there are plenty of failings of the security of various centralized information storage and processing systems as we have seen; they can become vulnerable to attacks by bad actors. some of those bad actors are trying to target specific people to harass, stalk, or otherwise harm them. you're not going to convince me that blanket surveillance of all financial activity is remotely optimal from a safety standpoint. and we have obvious human rights questions about mandated surveillance of financial activity. so, no, just because someone is in government does not mean i trust them not to abuse the immense power they've legislated for themselves. i can be doing absolutely nothing illegal and argue for the legitimacy of taxation and AML controls while still holding the above views about human rights, and for good reason.
For legal money transfers you'll have a hard time beating that. For illegal ones you're, well, illegal.
But that’s not because of transmission times (updating a database is faster than a blockchain), it’s because they get a better price for currency by batching you up with other people.