There are huge downsides though because moving power generation further and further from where it’s used opens you up to more disruption from terrorist attacks on the grid (and cyber attacks) unless you also do less centralized production which is going to be more expensive.
That's the thing. HVDC works better in a decentralised manner. You don't have clocking to deal with so instead it's mainly a matter of just hooking power production and power draw up to what is basically a big cross-country busbar.
And you can connect as many bridging connections as you want without having to worry about phase or desync. Instead more connections generally just means power goes from production to consumption along more efficient paths.
