All hardware becomes legacy hardware in time. Even if we assume they’re eventually able to deliver on all those great big shiny promises, I’d rather not have to schedule an outpatient surgery just to keep up on emails. Pocket touchscreens being practically mandatory is bad enough…
Someone paralyzed from the neck down for whom this enables the use of computers, which they before couldn’t do, probably would rather have the outdated model than none
Would they still want it if it became hackable and someone could do nefarious things to them which they no doubt will try?
That’s up to the individual, I don’t think there’s universal answer to that. If it eventually makes it possible to restore a person’s sight, hearing or the ability to walk, I’m sure most would take the gamble.