It’s kind of sad that one of the greatest video game series is on hold for now.
Conspiracy theories, multiple ways of solving a mission, game lore hidden in computer inboxes…
Are there any (pre-2010) games that gave you the same feeling or do a similar thing?
Definitely this. It was one of my most favorite games at the time I played Deus Ex HR, and it’s exactly the game it reminded me of.