This actually applies to JSW as well but in reverse. Let me explain as best as I can:
Imagine Manic Miner where you do not have to recollect an item if you should lose a life, upon such life loss the air supply will be restored (otherwise you could end up in a loop) but the items remaining are just that, if there was only one before M.W had an 'accident' that is the only one left to collect to complete the cavern.
This does pose a couple of difficulties however, Eugene immediately springs to mind here.
In reverse to this let us consider JSW: Lets say M.W had an 'accident' in The Off Licence. Upon restarting the room he would have to re-collect all the items in this room again. Obviously the item counter would of been decremented to match/reflect the real count beforehand.
The latter item count might pose a problem in keeping track of it all too.
Any thoughts on these slightly random ideas ? The former (Manic Miner) does seem slightly more logical.