What this clause does
A revocable living trust only governs assets that are actually titled in the trust's name during life. Funding gaps happen anyway. A new bank account gets opened. A vehicle gets retitled. The pour-over provision in the accompanying will catches those stray assets and sends them into the trust at death.
The trust then administers them under its own terms — the same trustee, the same distributions, the same protections. The will becomes a backstop, not the primary distribution document.