Probably a monetary issue; nanotechnology must be hilariously expensive. If they're mass-producing Spartans to be at the same level as the known Spartans, they'll need matching mass-produced armor. GEN2 armor has a higher level of customization and is produced by numerous manufacturers, both militarized and private. It's also entirely possible that the GEN2 is the mass-production version of the MJOLNIR Mark VII.
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