Automotive fuses directly on PCB
I've seen them in aircraft-grade inverters on the high-current DC side, directly soldered to the board (actually a number in parallel as PCB protection- IIRC 5 or 6 20A fuses in parallel off the 28V bus). 

Reasons they are not widely used: 


They're too high current for many purposes- the standard starts at 1A, and 2A is the next one up. 
They're only rated for low voltage, so useless for mains
applications. Few applications outside of automotive and other lead-acid battery based applications are high current
and less than 32VDC (there are some higher voltage ones designed for automotive applications with higher voltage electrical systems- rated 58V for use on 42VDC systems (but the automotive applications have not caught on as much as expected AFAIK (correct me if wrong), so I would be a bit cautious about those). 
One-time fuses are not preferably compared to other means of
protection; they're most useful for wiring protection. 


They do have some good features- easy availability and high (1000A) interrupting capacity being a couple, so if your application fits I don't see a lot of downside.