Living trusts are an excellent tool to deal with assets during a person's lifetime. The documents and the financial instruments they create can also give peace of mind to the people writing them with their lawyers.
Estate disputes sometimes revolve around siblings who seem like they just want to do anything in their power to "win" against the other sibling. They act as if dividing up the estate is a contest. They may also be emotionally pitted against one another, as if they won't agree on anything out of principle.
If you have an heir with special needs, you may consider setting up a special needs trust to help take care of them after you pass away. However, you may also wonder why you couldn't just leave the money directly to them. Why put it in a trust first?
A will is, for many people, the basis of the estate plan. It's the first document they draft. It may be all that they think they need.
When writing a will and doing estate planning, people often carefully consider how long they think they will live. After all, you need to do long-term care planning and you need to consider how many assets will really remain when you pass away. There's a careful balance here. Your estate has to support you at the end of your life, and you also want to give whatever remains to your heirs.