as smileysteve said anything except for cash has it's own burdens and commitment associated with it.
If I left my house to my brother who travels all over the place and has a carefree life it might be more of a burden trying to maintain it, rent it out or sell it than its worth. It might not, but that's why I would talk to him before putting it in a will.
Also, having these kinds of conversations is good for everyone involved because it makes them think about the little details beforehand and not while they are in the middle of funeral plans and grieving.
It's called estate planning, not estate liquidation or estate lottery. You wouldn't make major plans regarding your family without talking to your spouse or business plans without talking to your partners.
Just because you won't be around doesn't mean you should treat it any differently. Anyone involved in your estate should be involved prior to your will going into effect whether they be executors, caregivers or recipients.