Lu
This is a small point and it might be wrong, but I believe that the chip light and a spectrometric oil analysis serve two different purposes.
The selection of gears is based on their strength and on their durability. A chip light will detect a 'piece' of a gear, due to a lack of strength. The spectrometric oil analysis detects excessive wear, due to a lack of durability. The former being much more dangerous than the latter.
If this is wrong, I would appreciate being corrected.