I have a laptop, because that's what was issued to me. If I recall correctly, it's a lingering symptom of not having enough desk spaces in the company's early days, so people needed the flexibility to move around.

I appreciate the flexibility of being able to work from just about anywhere (though the practical limitations of working through a VPN mean that it's not "just about anywhere"), but I also wish sometimes I wasn't able to do "just one more thing" from wherever I happen to be at the time.

Really, I'd just prefer to have a desktop running Ubuntu, so I could match my production environment that I code for. But for some reason that's just not allowed.