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exactly why we dont use it and its not needed.I've been using it for a few months now. Great app with loads of features such as built in rom manager, root browser, auto start manager, memory manager, sd boost, custom boot & font manager all within one app. I've removed several other apps that were doing these features for me so hence have saved a good bit of space. However you pretty much need the pro version ($5) to unlock all the good stuff as the lite version is a bit limited.
More info here on the features etc:
JRummy's ROM Toolbox Loses Liberty ROM Exclusivity, Now Available For All Rooted Devices

).
Thankfully I was able to restore it.Can't say anything about the Streak specifically, as I've never even seen one (this is a Desire forum). But on a Desire you could only use Root Explorer to delete system apps if you are S-Off (i.e. NAND security disabled). Otherwise when running the Android OS you only have read access to the system area, not write. I suspect that the Dell might be similar, because I can't imagine them wanting to deal with owners breaking their phones by deleting critical apps (whereas if you have to perform a warranty-voiding unlock first then you aren't their problem if you go on to mess the phone up).
. But there are Dell Streak forums here as well, Dell Streak (Mini 5) - Android Forums and Mini 5 - All Things Root - Android Forums, so I was thinking that maybe someone there could give better advice with your device.