Stuff like TotalWar will hit 8gb RAM and if you're gaming at higher resolutions (1440p or higher) 16gb is a must for pretty much any newer game. Otherwise 8gb is still fine. But i recommend 16. Maybe just upgrade later.
No one in our house has ever needed all 8Gb of RAM. Record so far is my daughter at 6.5Gb, with an insane number of tabs open in Chrome, music playing, email, etc etc etc
8Gb is a good amount for pretty much any game. For me very few things go over 8Gb with a normal game, but there are small amount games that do use over 8Gb if the rest of your Computer is decent.
Stuff like TotalWar will hit 8gb RAM and if you're gaming at higher resolutions (1440p or higher) 16gb is a must for pretty much any newer game. Otherwise 8gb is still fine. But i recommend 16. Maybe just upgrade later.