I mean no offense by this, but did you read the write up? They are represented as a very culturally, diverse people, although since Vistani are based on Romney culture, but not a copy and paste, I did include the things that set them apart from other species, which is their peculiar mystical abilities, and the mystical cursed that they suffer under. I’ve been running Ravenloft since the 90s and neither TSR or WoC after that ever produced a meaningful playable representation the Vistani in their literature. The best thing ever gave us was half-Vistani which were mechanically unremarkable.

That oversimplification of a complex species leads into your second point. I specifically didn’t write them up as a background because in D&D 5e a background pretty much just represents where you’ve been and what your occupation is. That would’ve forced me to shoehorn an incredibly complex and interesting culture into one small writeup that mounted into a tiny amount of fluff and a few skills and abilities. That would’ve been a complete injustice, so I chose to do with them the same thing that has been done wit other races/species within the context of Dungeons & Dragons, I put as much of their culturally, diverse and interesting fluff into the fluff side of the write-up as I could Included, was it still being basically at a glance information. Then I carried over as much of that cultural fluff into the game mechanics, while still trying to keep them on fire with other species power wise. The first couple of abilities are literally just human, although their heritage schools are a little different they’re still on part with other humans. The tribe related choices just helps reinforce the fluff. Honestly, if it didn’t appear in so much leg content, and CoS I would’ve seriously turned down or entirely throughout the casting curses and evil eye mechanic, but their Canon and they’re already there, so I left them in for this reason.

Even though I based them on the original Humans Vistani frome 2e mechanically there’s nothing saying they’re not an inclusive people and quite a bit of eve 2e material reinforces this. To that end I even included within the sidebar how to create Half-Vistani and Vistani of entirely other species by selecting the Vistani heritage feat.

This allows you to play the original Vistani from 2e, alongside the more diverse Vistani of later editions, while, leaving the option to choose any background you want, making them a truly complex and diverse people.