No worries the OP already deleted the game so they don't have to understand it.
In all seriousness, it's fine if you don't like the style compared to previous games. You don't have to play hundreds of hours to figure out you won't like it.
But yeah like
@MutilationWave and
@Siptah said, many resources are very useful at different points of the game. Shuffling production resources (with camels preferably) to your new cities is the main way to speed up their early development, a bit like chopping did in previous versions. Stacking iron/horses to boost your infantry or cavalry is very important for effective combat against deity AI, or just to speed up things generally.
As for diplomacy, the main issue in the later ages for me is that city-state bonuses scale too well compared to those from endaevors, so in the Antiquity it's sometimes an interesting decision to prioritize one or the other, but in the next two ages it's all about city-states giving free techs, etc.