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the neck down for whom this enables the use of computers, which they before couldn't do, probably would rather have the outdated model than none
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.
Those should be closed systems and don't need to network with other systems and should be safe enough, its when we start networking that it becomes incredibly risky which is what neuralink is intended to do. I don't think the average person understands how many automated attacks are flooding interconnected computers as we speak and you're dropping someone's brain into that and we don't understand the scope of what can be done intentionally or unintentionally, it's not outside the realm of possibility an automated attack trying to rapidly port scan and compromise a neuralink could overwhelm and damage the device and cause brain damage or death.
There are people out there with short-range, wireless pacemakers with no security. Most just provide information you'd expect but some of them are also defibrillators (they can kill). As far as I know none have been harmed in an hacked attack but a hacked brain implant brings to mind more than just killing the owner. We may have an interest as a society in making this illegal because it's not worth the gamble to us for people's actions to be hijacked remotely.
I highly doubt that someone disabled enough to need implants like this is capable of doing damage to anyone but themselves. Like if you're interested in protecting them, sure I'll accept that. But the idea that society needs to protect itself from this is silly.
I don't understand how one could think brain implants is a totally safe invention for a society. Did you consider more possibilities than just manipulating people into to physically attacking others?
I doubt me giving suggestions is worth the effort here. I worry thoughts and beliefs could be manipulated with enough knowledge of the brain. Technology to interact with the brain directly is a revolution of the manipulation already enacted through our eyes and ears.
No surgery needed. Just insert the ElonDongle into your rear port to upgrade your ElonOS. The process might be a bit stretchy, be patient and don't remove the ElonDongle before it finishes the load to avoid unwanted residue leaking out of the port.