What kind of technological challenges are you referring to?

Those hundreds of millions with of value spread out in a block's transactions are unmodifiable by the miner who mines it, because they do not have the private keys to them. That's one risk mitigated.

Adverse mining group wants to take over more than half of the network? Well they have to risk having $310K for each fake block they mined voided after a chain reorg. No sane miner is going to risk throwing away one million dollars that can be otherwise obtained from mining three blocks honestly. Another risk mitigated.

The only real risk I see is since mining is now centralized in a handful of companies' hands, one of them is going to agree with some idiot regulation that censors part of the protocol for some people. I swear there was this one miner who already supported such a regulation, it was a US bill to audit bitcoin addresses made in the US and they controlled like 7% of the global hashrate, it was fairly recent too, like 1-3 years ago but I forgot their name (if anyone can find it, I will give one merit).