Nowadays, when I'm rendering small animation loops, I use Media Encoder to generate a bigger loop (10-15s from 2s clips), to be used in social media.

I'd find it VERY practical to have a simple cmd/ctrl-D to duplicate an existing asset, and not having to drag and drop on the stitch button or in the stitch source panel.

I could even create a stitching preset with intro/outro and drag and drop items…