Oh, I don't think it's incomprehensible why anyone would want one of the new Macbooks - I just know why it's incomprehensible why *I* would want one.
Performance is a pretty important factor for me. I usually have a lot of applications running as well as a Kali VM, so I couldn't really afford cutting my processing power literally in half by getting the new Macbook. Likewise for functionality - I frequently use thumbdrives and my external hard drive when I'm travelling, as well as various externals. When I'm at home I run an HMDI cable from it to my TV to watch videos (Netflix and otherwise), I also have a docking station for it at home so it becomes a desktop when I need it to be. (I don't currently own an actual desktop, though I probably will once I start building my home office and home network)
I won't dispute the better keyboard or trackpad. It's not something I've even thought of since my keyboard and trackpad work perfectly fine and I don't know how improving their quality would improve my experience. (I've also gotten in the habit of using the touchscreen more and more for various tasks - it sounds kind of weird on a laptop, but a lot of things are just quicker that way) All in all I can't imagine shelling out $1300+ (plus whatever warrenty, plus the $79 dongle to let you actually attach anything, etc.) that is in every practical way worse than one I can buy for $500 or $600. I can *understand* the appeal, though - maybe if I was a business professional or writer or something and travelled a lot and spent most of my time editing spreadsheets and powerpoints or writing e-mails, my main focus would be on ergonomics, comfort and style... and if I was afflluent enough where I wouldn't balk at paying an extra $700 compared to *other* ultrabooks out there and/or just really wanted a Mac, I could maybe see myself buying one. It's hard for me not to just see Apple products as status symbols, though.
As far as work laptops, though - this
is the laptop I usually got issued over the last 3 years and I absolutely love them. Hot-swappable hard drives, high performance, 15 hours per battery (of which I carried several), practically unbreakable... unfortunately I can't really think of any reason I *need* something like this at my new job but I can always dream.