I have used both ways to produce mender artifacts for pi4:
using mender-convert tool
using yocto and mender-binary-delta
With mender convert tool, golden image was generated from raspbian image, patched with mender using mender-convert tool and mender artifact size was roughly 1.5GB
With yocto and mender-binary-delta and mender-binary-delta tool, rootfs image was roughtly 60M
Why so much different in artifact size from either ways?