Well you're the one who first brought it up, about some people landing spinning hook kicks and spinning backlists more than they land round kicks and straight crosses so if there's any evidence of that it would be up to you to provide it as you are the one that first mentioned it. All Im saying is that if that is true, it just reinforces my point all the more as to what moves work best depends on the person, to a certain extent.
No mate. That's not what I said. I said that I'd be surprised to find people who trained equally hard in both techniques but had more luck landing the spinning backfist than the straight cross or the spinning hook kick more than the round kick. Point being that, all other things being equal, the simpler techniques will be landed more reliably (i.e., higher percentage).
I do know that in Taekwondo they like to throw lots of high kicks and they also do lots of arial techniques, Im not familiar with FMA that focus on empty handed techniques, the FMA that I know of such as Kali focus on stick fighting and it does have some empty handed techniques but not until you get more advanced. Goju Ryu also uses some low stompy kicks. The specific FMA that you mentioned I know nothing about.
I started in taekwondo. I'm familiar.
FMA is confusing, I'll grant you. Kali isn't actually an FMA. It's a generic term describing FMA, as are "eskrima" and "arnis." A couple of the styles I've studied (e.g., Doce Pares) have shifted from using one or the other term to match the popular term of the day (i.e., we shifted from saying "Doce Pares Arnis" to "Doce Pares Eskrima").
Many FMA styles begin with sticks and progress through knives, swords, etc. Then to empty hands. Though the exact sequencing (if they're sequenced at all) varies from school to school. For us, kicking and punching were introduced fairly early on. The most characteristic kick was called sipa, though I've seen the same kick in savate (coup de pied), gung fu (cross kick), and JKD (oblique kick).
A very simple, low-line kick to your point.
There are FMA styles that feel like Filipino interpretations of other styles that feature empty hand more prominently off the bat: Geronimo Meliton's Sikaran (taekwondo) and Yaw Yan (muay thai / kickboxing).