I'm joining the cracked screen chorus here. My Surface Book 3 is a little over a year old, but it never leaves the house and seldom leaves my laptop desk. I just read through over a hundred comments that pretty well establish that there is a design flaw in the SB3. Cracks appear in nearly identical locations without any apparent rough treatment. It also appears there is consensus that Microsoft is in denial of any flaw, offering only a refurb replacement at substantial cost.
I'm not a newbie; I've been using laptops since the Tandy Trash 80 days. I expect challenges when cramming powerful CPUs and video cards into lightweight cases. But I got 15 years of trouble-free use out of my high-end ASUS before retiring it.
This clearly is a design problem with the SB3 that should have been addressed by Microsoft when they first learned of it. It will be much more costly to Microsoft's shareholders when it reaches the class-action level.
Meanwhile, I'll go looking for a local shop for a replacement. Afterward, I'll slip a sheet of thin foam over the keyboard when I close it. Needless to say, this will be my last Microsoft laptop.