Can confirm. As someone who played the PS1 version of Civ2 extensively, the advisor council and wonder vids were things that added some real flavour to the game. Yes, the potential to lose a whole stack of units all at once forced one to consider unit stacks and unit spread. The one exception (in the PS1 version anyway) was if a stack of units was occupying a fort; they would be protected from the "kill one kill all" rule inside a fort. I think there was a limit to how many cities that could be at any one time, something like 255 cities (at least in the PS1 version)? Not sure how many exactly though. I still have my physical copy of PS1 Civ2, complete with tech tree poster, and yes there are a lot of techs the discovery of which is dependent on other prerequisite techs being discovered. Freight (and caravans IIRC) was also useful for helping to rush-build wonders. One thing I miss in later Civs is the ability to spam freight to quick-build wonders.