I think anyone could play the first game and the second and it's so obvious why it lacks a lot of the magic 1 had.
I can't find a single thing positive to say about the second game besides Eothas being enigmatic and interesting.
I put 300 hours and 2 conclusive/extensive play throughs into part 1. Part 2 feels strictly inferior even in the roleplay aspect, because options don't seem to change much besides rather or not you fight someone and rare at doing that. Why do we have so many skills that could be consolidated? Alchemy and explosives could be a single skill. Intimidate, Deplomacy, and Bluff could be a single skill. Metaphysics and religion could be a single skill. Stealth and sleight of hand OR sleight of hand and mechanics could be a single skill.
I rolled a wizard, having played rogue and paladin in the previous game, and expected similar treatment that Aloth got in PoE 1. I am somewhat bitter 50 hours into 2 as a wizard. I am considering rerolling but I have at least half of the map revealed. It is just so miserable to play with so many limitations.
On the nature of roleplay, Eder is the only character so far I have had any meaningful or interesting interaction with and his banter is the only one I appreciate to listen to most of the time. It's like every female except maybe Woedica is the exact same voice actor. It's a dredge to wade through and I don't think I will recommend the game to anyone really. It's like the difference between Planescape Torment and Torment Tides of Numenera. It's just so obvious and empty.
If I had to guess why so few people bought it, then I would say it didn't receive the love the first game did both from the developers and from reviews. I always hear about Tyranny and PoE when I talk to someone that's interested in modern cRPGs but I never hear about PoE 2 and I think that says something from start to finish, from release to now