The curved edge serves a purpose: It easily moves the striker and prevents marks on the door jam. In this house, though, the builders installed the same type of striker plate for the locksets and for the deadbolts. Deadbolts don't need a plate with a curved edge because they click into place only after someone closes a door. Why the builders installed the same type of plate for locksets and deadbolts is beyond me. Maybe they had a lot of them and lost all the deadbolt plates. They must have lost some of the plate screws, too, because in places they used drywall screws.
A very professional job all the way around. I mean really.