This has nothing to do with "decanting"?
Decanting means the distribution of trust property to another trust pursuant to the trustee’s discretionary authority to make distributions to, or for the benefit of, one or more beneficiaries. Decanting isn't legally permissible unless the trust expressly provides for it.
Your comment about the trust being amendable after the death of the trustor is moot. For starters, a trustee (who is not also the trustor) rarely has the power to amend a trust. Additionally, the standard revocable living trust that is used in estate planning automatically becomes irrevocable upon the death of the trustor.
So...you're aware that the power to "decant" only applies in a situation in which the trust instrument does not expressly say otherwise and in which the trustee "has the discretion under the terms of a testamentary instrument or irrevocable inter vivos agreement to make distributions." If you're creating a trust that gives the trustee the authority to make discretionary distributions, you would be a fool not to have an attorney draft the trust for you.