> With partial updates the latency can be pretty low. There are many ways to control ghosting in a way that doesn't affect the latency too much (essentially, refresh asynchronously - and again - only where needed)

I would be interested to see some proof of above, I haven't myself seen a usable implementation that successfully controls all those behaviors and latency. People will often point to Dasung but I've used it and I feel it is unusable.