I disagree. I'm happy to install Linux from a USB stick. I'm not happy reflashing a BIOS. Have installed many, many laptops with Linux (ironically, my all time favorites are older Lenovos like the X220). I've not once flashed a BIOS.
Not being able to change the OS on a laptop severely reduces its aftermarket value too. My laptop originally ran Windows. I bought it second hand to run Linux on.