AFAIK, it's the most promising technology for actually making the neural lace.
TL;DR: If you put electrodes on an angled plastic mesh, you can roll it up, inject it, and it'll safely unroll. Also, brain cells like to grow into it.
IMHO, future AI should be used to enhance human cognitives in a noninvasive way. Never in such a dystopian way as in the movie "The Matrix".
1. Many humans today are already "monsters" compared to what was considered normal a few hundred years ago. You could spin a simple hip replacement or bone marrow transfer as "Frankenstein-ian" if you wanted to.
2. If AI becomes vastly more intelligent than non-"monsterified" humans, then the question may become: "Do you really want the human race to be enslaved / extinct instead of creating a monster human species?"
Half my mind is already in cyberspace, why not make it half my brain, too?
Edit: Dystopias don't come from technologies, they come from people being shitty.
(OTOH we're talking about a technology that could potentially directly modify human psyche, so even that isn't clear anymore :))
Since it's this that is the primary reason that all of the next generation of technologies are incredibly dangerous existential risks, and is related to why other mitigations for existential risks are underfunded compared to the grand projects of being shitty to each other, it seems to me that fixing this should be the main priority of human research.
It involves coming up with at least workable answers to a lot of difficult questions and is a bit of an ethical minefield, but if you believe, as I am inclined to that the alternative is extinction, it seems pretty important to at least make a stab at it.
What happens with the equivalent of drive-by ransomware on your brain? Send bitcoin to this address or we permanently give you a migraine?
It will happen, whatever is your personal point of view (or fears) on that subject. In 20y or 200y (or maybe later), but that will happen. Technology is going forward no matter what you think and vote, because there will always be that kind of people that can't stand living a 'standard' life. Go check the Myers–Briggs on personnality types: not everybody is a mainstream xFxJ ('earnest traditionalists who enjoy keeping their lives and environments well-regulated' as wikipedia says).
The real questions are: what pourcentage of humanity will go that way, and how well will humans/neohumans cohabitate.
Right now computational neuroscience is using a lot of blunt instruments such as electrode arrays which are implanted into mice for the duration of a few experiments before the animal is put down for ethical reasons. Safe, minimally invasive brain implants would make long term experiments a lot simpler and more ethical.