Again, agree on the utility of the FAL and AK.
But for the tinkerer and garage builder, both require tooling (more expense) and skills beyond the average.
Something a person with hand tools can build easily. Something with all US made parts, so you’re not dependent upon a foreign factory or used parts kit.
As for the use around the world, the AK was given away by the Russians for so many years, better or for not they’re everywhere.
The FAL and G3? Sold heavily to anti-commies everywhere, again they’re already there.
Like it or not, it fills the bill nicely. After 50+ years, it’s still an effective rifle, being upgraded and improved, and most shooters (and even some liberals) have them.