I'm a bit confused and am struggling to see what Guild of Dungeoneering is a simulation of. And also how an expansion can win game of the year.
The 'Simulation' category also has games that would probably be labelled as 'Management', simply because we never created a separate Management tag (Last year the two tags were lumped in together anyway, if you check the 2016 master page). It's not elegant, and to be honest we've probably mislabelled some things along the way (perhaps GoD isn't as much Management as it is other things), but in terms of the voting process it's a lot cleaner because as much as we sometimes get it wrong, you guys can't always agree what category a game belongs to either
At least this way games are only ever going to belong to one category.
As for the fact that an expansion won... as I explained, it was the only one out of the three tied winners that got 5-stars. The other two only got 4-stars. It's a tad arbitrary but it's better than me stepping in and just deciding who won, which in my mind would have been worse. It was eligible to be voted on as it was a something we reviewed that got 4 stars or more, and people voted on it. Can't really help what you guys enjoy, although I agree there's an argument to be made for it not being eligible to be voted on in the first place.
Hope that helps, thanks for continuing to read and engage with the site