I think, to summarize my experience and, apparently, that of several others, that as the game stands now, a little less than 2 months from Release:
4. Another potential problem is Too Much Of Everything. By this I mean Infrastructure which, by my count, has about 3 times more components/structures to build as in Civ VI, in a game that's supposed to have fewer turns in it. It sometimes seems as if you are constantly 'running in place' just to keep up with all the possible goodies being thrown at you, even with slow Tech Progression compared to the rest of the game. I understand the game is designed for a player not to research every Tech or build every Infrastructure piece, but most of the Infrastructure provides only incremental effects, so you are really encouraged to 'stack' them for best effect, and that requires more building time than you have, seemingly. Again, this may be part of the Pace Problem from (1) above.