its just a bit like real life

with the full release of the modpack there is a tone of new features added 

tones of new building blocks

when you die you gat a corpse where you died instead of your stuff spreading allover the place.

trees have seen a hudge update with them now falling over and they grow way better (some trees are the same)

a bug with infinite water souses staying in ocean biomes has been fixed.

there is a load of other miner changes so look at the relations if you want to know exactly what has been implemented