As a new / casual player, you can ignore the meta discussion going on. The generally recommended hero weapon is Hercules axe. It gives you a 25% def debuff on burst of wep/eido frame which can be pretty handy. Other than that, Hercules is ridiculously good hero with her 5 turns long buffs (leaving you with only 2 turns of unbuffed Herc) & a pretty decent nuke.
Even afterwards.. borken light himes keep getting released.
Tbh, taking a look at the end-game wind content, you can basically ignore debuffs. I heard Quetz GO is pretty easy, other than that, Lust, tower boss, Icarus GO, all of them resistant to debuffs, so meh. But again, this is mostly a veteran and/or whale perspective.
3t CD. But yeah, you got the main issue with Herc. She's definitely not slow, but wind burst meta can be further optimized by using Shingen.