I have always thought that THIS is why in Humankind all "civs" felt "generic". You are playing as a civilization but you are picking a new civilization throughout the game. So despite the variety, it just feels like you are just playing "blue" or "green".
So you are not actually playing a civilization - you are playing a leader. And yes, that makes your "civilization" feel like a generic entity over the course of multiple games. Even if it has flavor, upon Era changes, it can feel disorienting when suddenly, now the Assyrians are known as the Egyptians and the Phonecians are now known as the Mayans, etc. With all civilizations in a state of flux, it can feel very impersonal both for you and the other civs on the map.
Hopefully, this is where only picking 3 will help as it is more time with each civ to become invested in that cultural playstyle. I do see some value in consistency empire identity through banner, or namesake. At the end of the day we are playing a game, and this is not realistic with 1 ruler guiding multiple civilizations. This is a very video gamey concept as it is, and clear non-shifting team identities holds value. The previous 6 iterations used your civ choice as that identifier. But now it is only border color and that can make it feel generic as it can feel like you are just playing "blue". I have just taken the stance that I will just have to wait and see what is there before I can make a judgement. Sometimes the whole is greater than the sum of its parts and sometimes it fails to live up. But until we see the whole, what few parts we can see (in the grande scheme of 100s of turns) does not give us enough to make more than an estimation beyond simply whether it interests us or not. There is plenty of room in those estimations for disappointment and to be impressed though.