I've talked to Lord Gortash before his big coronation and, well, I think this was handled in a way that stretched my suspension of disbelief a little bit.
I mean, there we stood in a huge, open chamber, surrounded by the high society of Baldur's Gate and Gortash revealed his entire villainous plan, his voice echoing and reverberating from all over the walls. He didn't even whisper or anything - there's absolutely no way the gathered aristocracy didn't hear how he plans to turn into a petty tyrant, saving them from a horror he himself unleashed.
Larian could have handled this a bit better - he could have invited us into his private office/study for a chat, not lay out his entire project roadmap right there. His plan does require a certain amount of discretion, especially when dealing with doppelgangers.
Which, by the way, is another thing I'm not a huge fan of. Yeah, it was fun and interesting in the first game but it was a plot point that gathering this many doppelgangers was a huge and unprecedented feat by Sarevok. It didn't need to be repeated. Of course I'm still early in the Act, maybe it will have a big payoff that makes it worthwhile or they take it in a direction I couldn't possibly expect, something like that.