Always a good idea to order a spare, I have both 14 & 18mm glass bowls, both from NV.
Yes, it’s way easier to combust with a glass bowl than a Ti bowl.
As I said before, you need to be more careful with a glass bowl, some precautions...
-like not heat soaking for too long...
-or forgetting the FP head, on the bowl for too long...
-or loading too much....
-or not keeping the glass, or added screen, clean enough....
-temps close to the 700Fs are another risk...
-draw speed is another factor....
This is all exactly the same precautions as any other FP head.
I used a glass bowl for a long time and didnt find the glass bowl any more prone to combustion than any other bowl.