Friends come and go but enemies accumulate.

Arthur Bloch
Profession: Author
Nationality: American

Some suggestions for you :
If you improve or tinker with something long enough, eventually it will break or malfunction.
A failure will not appear until a unit has passed final inspection.
The compromise will always be more expensive than either of the suggestions it is compromising.
If your project doesn't work, look for the part that you didn't think was important.