Chair:
That would severely limit the choice of computer chairs I have to choose from, from several to one. Also, what happens if you go on vacation for a week, pig out, gain 10 pounds then get back on the computer? It won't let you on. What if you're leaning on the desk all day so that some of your body weight is supported by it, the chair wont be able to get an accurate weight. How about if your really cold one day so you have on a heavy jacket and other heavy clothes, then the next you decide to go in the nude? Someone could just ask you how much you weigh casually and you tell them so they go get a few 20 pound weights, put it on the chair then log in. They could even just look at you, guess your weight to around 10 pounds, then add/remove 2 pounds until it lets them log in. Hell, what if you decide to move your computer for a lan party, are you going to drag that chair with you? This also wouldn't work for laptops.
Mouse:
Same with the chair, in that it reduces the amount of mouses I can choose from, from several thousand to one or two. They already have stand alone thumbprint scanners (mostly used on laptops, but you can buy them for desktops) that would be simpler to use and don't make you buy a special mouse. Also, why does it constantly scan the palm print? Am I going to go take a piss and have someone break in and hack my computer in 30 seconds? Also, I dont always have my full palm resting on the mouse, just the tips of my fingers, so would it refuse to work if my full palm wasn't on it?
Hand Size:
I've meet several people with hands that have nearly identical sizes to mine. Plus it would only work if I had my full hand resting on the mouse, which I dont like to do.
Special Phone:
No idea what you mean by that, but it sounds like your phone would be used to unlock the computer and it would only worrk if the phone was nearby. Well if someone left their phone at their desk, that would be just as bad as writing a password on a sticky note stuck to the monitor. Could you use the phone and the mouse at the same time?
Whats wrong with just having a really good password? I have about 4 different major passwords I use for different things, all of them with a seemingly random combination of letters, numbers and special characters and no shorter than 8 characters. I also change them up every once in a while too and I have never once been hacked by someone guessing/gaining access to my password.
If you are super paranoid, get a retina scanner.
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