QTP - 28 - Why we not only use Odinal Identifiers if they can uniquely identify the objects ?

We can't just use Ordinal Identifiers to identify all the objects. There are few limitations of them :

(1) If accidently or willingly the position of the object is changed then the Ordinal Identifier will not work.

(2) If two objects are overlapped on each other than location based object recognition will fail.

(3) If only index based recognition is used your script will work but script execution time will increase.