Until very recently I was traveling for work every week, and the gaming laptop on which I am typing this post saved my sanity and liver in plenty of hotel rooms. It is a Clevo P150SM-A, weighing in at about 12lbs including AC adapter. It was not fun lugging it around airports twice a week while waiting for connecting flights. But it did the job, and I could play Fallout, Skyrim, Bioshock, Dying Light and many other games at very respectable frame rates. Even now that my traveling days are done, I am sitting on my balcony with a cup of tea, enjoying the end of the Canadian summer. I can also set it up in my living room while my significant other is watching TV.
I had gaming desktops for about a decade, and I just got tired of being stuck at the same desk in the evenings, while spending my mornings at a different desk in the office.
I am aware that a laptop's performance will never come close to that of a desktop. But if you cannot understand why someone will make that trade-off, don't click reply.
All that said, I am surprised nobody mentioned the significant issue that Nvidia has with the Windows 10 upgrade. NBR is full of reports of black screens after upgrading, and the cause seems to be the Nvidia driver overwriting the LCD EEPROM. It seems Alienwares are particularly affected, with a few Clevos as well.