Its the only T series laptop in the T46x generation that has a removable external battery.
a. Its built like a tank
b. It doesnt offer either a dgpu or a high resolution screen. For me this is a positive. On every recent laptop I have tried I have come to regret a high dpi screen or a discrete gpu since both those things compromise on battery and thermals extensively. Giving up on these two features means you win a lot back in terms of real world comfort. This includes my 2013 Mac Pro with the Nvidia card - the thermals / battery life on that are iffy. Apple does better than other vendors at extracting battery life out of a discrete GPU but that is not saying much.
c. I own some Intel 750 nvme drives on my desktop. For all the work I do I dont see a measurable improvement when I am using those over the sata drive that comes with the T460.
d. I do admit that over time I have begun to lean into the less is more philosophy when it comes to hardware.
e. Getting 15 hours of real world battery and then hot swapping the external to get 9 / 10 more really changes the way I use this thing.
This is only the second machine I have owned where I am tempted to order a second machine to stash away for future use.