Magic Item Daily Uses?

Hello all! I'm a fairly inexperienced 4e DM (very experienced in other systems, especially 5e) and I'm trying to find the consensus for Magic Item Daily limits.

As I understand it, in the base rules, you could only use one Magic Item Daily power per day per tier, but at some point in 4e's lifespan that rule was lifted. I believe the limiting factor is now meant to be that Magic Items have rarities but each power can be tracked separately, and the DM is meant to control power level by managing rarities.

Is this found to be useful in practice? I'm considering making it 1/day as per original rules, but each Milestone gives you one use back (each item no more than 1/day), so you can pace them throughout the day without saving them all to go nova in the Final Fight. But, as mentioned, I'm not a veteran in this system and I don't want to go messing with forces beyond my understanding and throwing things off.

My players just finished Keep on the Shadowfell and I'm wanting to level-skip them up to 6 so we can run Madness at Gardmore Abbey, so I'm looking at the "start at higher levels" rules to boost them which looks like level-1, level, level+1 items (and gold level-1), so they're about to go from some of them having 1/day item powers to probably all of them having several.

Thanks for any advice you can muster!