An idea like this seems so simple and it's good to bring up and point out. That is in fact what has caused many in the past make some poor decisions.............it all seems so simple.
I'm sure extracting a strip from chin/throat area is filled with complications that one can't even imagine. It's only when the complications are presented as possibilities does one hesitate and say...............hmmmm..............okay I didn't think about that..............and I'm sure that it would apply to trying something like this.
Always go with what has been proven to work and has a large body of evidence and has been backed up by actual patients.
I have noticed a poster on another forum that was in a way promoting a new fue type extraction device over the summer. He seems to be working with that forum and he is all excited about trying this device with having zero experience in hair transplantation. In my opinion he seems to be an amateur at trying to create this buzz which is what it is.........creating buzz so that others are tempted..........it all becomes a big game. Some of these guys have become very sloppy and I will blame that on the money being too easy. Reminds me of the drug dealers that would come into the club with shopping bags filled with cash.................that got so sloppy and it did not end well for them.
That is not what is happening here but the same would apply. I would not encourage extracting a strip from the throat/chin area it's a bad idea long term............just my opinion though................others might be okay with doing this.