For one, I imagine since this project is more academic in nature (as opposed to commercial or for entertainment) they aren’t optimizing for flashiness but for historical accuracy based on the archeology. Second they probably have a lot less funding than a high budget video game. It would be cool though if the makers of Assassins Creed could devote some of their big budget and expertise to helping this project shine, as long as it doesn’t detract from their core mission of historical inquiry and accuracy.
Rumors has it that a future Assassin's Creed will be set in Rome entirely. Why the downvotes? This would be an obvious great combination of these two projects.