Alternatively you can argue that disc set strikers are one more part to go wrong. Since we no longer use corrosive powders and breech faces should not corrode like they used to when primers were less gas tight than they are now, they are of dubious practical merit.
Like most things, when made to the highest standards with the best materials they are welcome but there is nothing to miss if they are not a feature. On cheaper guns, they are an additional cost with little benefit, especially if made cheaply.
If you break a striker, you will want to dismantle the gun anyway in case part has fallen into the lock work.
Some boxlock guns may or may not have integral firing pins. That is a separate issue to the disc-set strikers.
