Destil said:*sigh* 4 encounters per day means one thing:
The EL ratings are based on the assumption that a party of 4 at level X with items totaling a GP value approprate to level X can fight 4 EL X encounters before spending all of their 'resoucres' (spells, hit points etc.) A 5th encounter would most likely be a TPK as they should be nearly out of usefull spells, low on HP et cetera.
The designer's assumptions (4 characters, 4 enc. per day, and probably many others) doesn't influence only the CR system, they are also used to "balance" class abilities, spells, etc. so that each PC doesn't always outmatch the others during a fight (that's why the druid changed so much, that the rogue got evasion, etc.) and that's all the topic is about!
Changing these assumptions and keeping a good share of the "spot light" on each PC can be really difficult (some combinations are worst than the others, a psion is an example, but there are many others).
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