I don't disagree with leaving a charge in the bore for a few days or couple weeks. Unless moisture gets to the powder it will shoot fine. My personal practice is to only leave a charge if a know for certain that I will be going out again, as I have the day planned. If I don't know when or if I'm going out again I shoot a stump or some soft earth.
I just don't like leaving them charged long term. Read any post that 'just picked this up from a relative, neighbor, flea market or gun shop' and somewhere in the first few replies someone will say 'check to be sure it isn't loaded'. That's the risk...every intention of taking it out again but got a different gun, moved, got sick, or whatever and the family is handing around a charged gun totally unaware.