He is at the age where he should be at the peak of his skills and speed but that is not true.
The pace has gone down from mid 150s to low 140s and the accuracy or skill was always non-existent. The batting skills never developed & while fielding is still okay, it is nothing special. His body also should be in a good shape because he didn't have to go through the grind of first-class or pathway cricket & has suffered no real major injury but it already feels that it's on the downward trend.
It is weird to say that his non-inclusion is beneficial to him at this stage of his career because the replacements would get carted around as well & all of a sudden the cricketing population of Pak will have collective amnesia and forget how average he is & will clamor to have him back in the team.