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Yeah, [AA]K is terrible for Razz. one, you have a paired hand and two, you’re showing a King. There’s a big component of strategy in Raz around what is the opponents board showing and playing against that. Blockers come into play when you have played a few streets and see that your opponents needs either a 2,3, or 5 to have a made hande that beats you. Then if you have a [35] hidden you can use that to inform your decisions/actions.
For omaha H/L, there’s a huge component of having multi-pot playability, so the ability to win both the high and low hand. Making a hand like {A2xx} super powerful and wheel draws the nuts.
Also, in those split pot games, 9’s/T’s/J’s become really ugly because they limit your ability to win the low, and don’t have that great of equity in high only scenarios. So in Stud H/L if I have a hand like [T8]T, I have no interest in playing for maybe half of the pot.