Ya music production is all about loops that repeat that are catchy.. which also work together.

This is why beatmaking is so hard because it’s not just basic music theory.. it’s creativity.. and usually the more SIMPLE you can be, the better the beats are, because what is catchy is often simplicity of everything gelling together.

Chords are definitely needed, and some tracks only have chords, but a lot of time that catchy melody is required for that catchiness that the listener is waiting for.

Usually a combination of both chords and melodies allows you to really mix up your arrangement.