My whole post was spontaneous, it would take me a lot of extra time to do that.
It has 21 points, is not difficult.
My thoughts on that topic
For the 1st and 13th (or writes and other developers for the 18th) A.I. that requires a lot if you wanted make it right, hardware that supports graphics, algorithms, motion capture, the writers, search and anthropological study (depending on what is done), background music and ambient sounds, the people that make it (thats money, a lot of it that is quiet expensive.) and many things that escape me.
For the 2nd not loading screens thats hardware thats requires better boards thats means more money and most of people dont want to pay a lot of money for a machine or pc (not my case).
The 3rd to 11th, 14th to 21st a couple of people or group that address each or the ones that are similar (more money).
12th day/night if it necessary to the gameplay like attack, steal something like that, make day/night cycles is more money to invest in artist, music, models for plants, people, animals, buildings, shadows and weather effects on every surface (rain, lighting, wind, fire many others), that the lore behind it makes sense.
Some of them are good points but In short is a looooot of money for doing that..