Oh god, I hope not.
The edge of my MacBook Pro are already tasking on my hands, I would not want that in my pocket all day long. Maybe in a regular sitting position it would be alright, but if I'm laying down or sitting in an irregular way, no.
Sure, it might look nice, but there is more to good design, especially in industrial design, than looking good. It needs to function correctly and feel good to use, even when it's in my pocket, before it needs to look pretty.
Not to mention if you leave it in your car or outside on a warm day. Yeah, it could happen with a MacBook, but I'd think you're more likely to have your phone with you more than you have your MacBook. And sure, you could get a case, but they make the phone more bulky, add weight, etc. The phone should be designed so a case is not necessary in any normal condition.