5-3-2 has some issues in that many positions need qualities, and have to do things they need to do, that they don't do in most other formations.
1. The wide CB need pace and they need to cover the "hole" behind the wing-backs.
2. The wing-backs are more "box to box", they don't try to get to the bye-line and they are "first defender" not "second defender" out wide.
3. The forwards have to be mobile and provide width up front on their side.
If you have small mobile forwards and very strong mobile CBs, you can gain an advantage, particularly if the other side doesn't know how to adjust, but against a 4-2-3-1, it can be suicide, because that wide mid-attacker usually ends up in a mismatch against a CB. Then (as mentioned) the wing back drops back to provide permanent support, and suddenly your team has no width at all.
If you had 3 CBs like Koscielney then you might think about it, and if you are smart you still don't play it..