I have no interest in freeguild humans in Age of Sigmar but that’s like, 95% because I never cared at all about the Holy Roman Empire or its Fantasy-world equivalent(s) in Old Warhammer, (and I don’t really like how comically ‘dung age’ medieval Brettonia’s models were with bucket helms and everything) and since those are the models that are still around for AoS, that’s what’s available for ‘rando humans’ if you wanna play that. The models are designed to be a bit silly on purpose- goofy gap-toothed grins, silly hats, slashed doublets, etc. Which is fine for what they were- you’d have a good laugh if a giant fell on them -but they’re not nearly metal enough to fit in with the Age of Sigmar aesthetic, which is best described as ‘totally fucking metal.’
That said, if they came out with like, renaissance-era mans who looked more like Ottomans, or Japanese, or Songhai, or Cossacks or something, I’d be doomed, and start IMMEDIATELY building a ‘Free City’ army that included my Stormcast mans, Wood (A)elf mans, and some Hu-mans. The thought of taking some Kairic acolytes, giving them third-party heads and khopeshes so they could pass for not-Egyptians really appeals to me, given my Lord Aquilor’s backstory- his people!
But it’s fine; he can just hang with other Stormcast and some aelfs because I do not have the time, money, or fucks to do that heavy a conversion on a bunch of chuds.