The status bar is required for several of the Easyuo variables to be populated.
There is a difference between the CC and EC clients in what is displayed. So much of the information that is not included in the CC client is available via routines to determine values: SSI, Inherent LMC, MR, LMC, etc.
Some very useful formulas are ILMC, LMC, Stamina, FC, FCR because they help with determining what is required for when to time the next step (how much mana is needed, how long you must wait for casting the next spell, etc).
Most scripts seem to depend on #HITS, #MANA, #STAMINA as the tests for when do take an action. Some of the other data from the Status Bar can be really powerful when including in scripting.
Gaderian