i found my info from phanimars streams the developer and he talks about it look up phanimar or ee3 and red matter is removed because it is overpowered dark matter will still remain
the condenser collecters and other part of a power flower were removed an alternative will be put in for the condenser and other things
EDIT: I double posted to add the info i left out i messed up and i should have edited it in ok sorry...
ee3 is in development and is still adding items and things they have not added emc yet it is in dev so it is being worked on and the ee2 version has not been updated to 1.4.6 so they had to use EE3pre1f wich is a pre release not the full mod yet