Naga's on the second screenshot look absolutely identical to BG and IWD. They created their own universe and therefore can design creatures however they want but NO!! Nagas, forest trolls, ghouls, giant spiders, ogres. Shame!!!
Yeah, but the first kickstarter was built on the promise of a spiritual successor of Baldur's Gate. Guess how people would've reacted, if there were none to a few recognizable monsters.
Even here on the Codex, people were incredibly butthurt over the fact that kobolds were called xaurips.
Oh, why can't I have proper kobolds, now I have to call them by this stupid made-up name!
All while simultaniously bitching about the "fantasy language" Sawyer created and the names of the gods etc.
From an economic point of view, going for the iconic stuff was the right thing to do, even though it was also the more/most boring thing to do.