I'm all for written exams, but not on the traditional physical Blue-Books. Just allow students to use traditional paper and then staple the exam to their answers as they're turning it in.

On the few occasions (3) I took one, I ended up "punching through" the paper every single time. I tend to write with high pressure and the paper quality is atrocious. Twice, the tares were so bad the book was partially de-bound.

On both occasions, when presented with a "torn/destroyed book" I had to show the proctor the "issues" and then, very carefully, hand-copy over everything into a new book in their presence--absolute PITA.