Well, [MENTION=27897]Ryujin[/MENTION], what essentials did was basically republish the magic item rules and pages 275-284 of the Rules Compendium. These rules are basically the same as those in PH1, except:
1. They introduce item rarity; and
2. They make no mention of item use limitations.
While they do not explicitly state they get rid the daily item use rules, they don't need to - its what I call "repeal by removal". Basically, by introducing a new and comprehensive rule set which doesn't include a previous rule, the previous rule no longer applies and is "repealed".
I think we may have differing philosophies on rules interpretation - it appears you see the general item rules that exist at the time as being "read into" the items themselves, such as that a future change of the general rules only effects items released after that change.
I, on the other hand, interpret the general item rules as being rules that "sit on top of" all the items, regardless of when they are released. So, if you change the general rules, that change applies to all magic items in the game, even those that predate the change.