As someone who moved to the US for work, one important benefit of 'the certification aspect' is that it'll open up travel opportunities he'd otherwise struggle

As someone who moved to the US for work, one important benefit of 'the certification aspect' is that it'll open up travel opportunities he'd otherwise struggle with: most work visas require a degree, sometimes 'or equivalent experience' but that's harder to demonstrate. If he actually wants to immigrate somewhere the degree may also provide points for that.