I understand most of your points except your main one:

My main issue with reggaeton is that I find the lyrics limited.

This is simply not true, and maybe it's a common misconception because native speakers aren't hearing the lyrics the way a learner is? Reggaetón, especially when it includes what is essentially rap as the verses, also includes more words than your typical pop song or cumbia. Here's what I personally learned from one song, Chulin Culin Chunfly by Voltio:

-raya, partidura, blancura, hebilla, bombilla

-celibato, the expression tirarme de, barranco, calanco

-brotar, mazorca, la Mujer Maravilla, la fiebre amarilla

-the expression "con sabor a," chango, the expression "fuera de ritmo"

-piernas sambas, volcánica, orgánica, botánica, aceitosa, mecánica

-the expression "aquí está todo bajo control, the expression "prenderse en fuego"

Plus, it reinforced two important uses of the subjunctive--"Ojalá que tú seas [mi mai jaja]" and "después de que me des el canto"--as well as how to say negative commands--"no me patees."

That is a lot to learn from a 4:39 song. And because it's set to music, it has stuck for life. I have learned far, far less from entire hour-long episodes of TV shows!

And here's a quick rundown from a more recent hit, Rebota by Guaynaa: rebotar [obviously], debilitar, reprender, procrear [which I knew, but it became active knowledge], the expression "estar en ley," the expression "librar a x años," what "ASUME y Hacienda" means, the expression "X me tiene en estado de aborrecimiento/etc." Again, really not bad for 3:25.