Also interesting to note that Ninja can just ignore Aeolian Edge and spend the majority of the time at the flank for a similarly small loss (less than 2% dps), which additionally makes Huton refresh braindead and removes a button from the rotation.
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The positional requirement appears when you level up. At the beginning both skills doesn't say anything.
A good qol would be is they just put the full skill description from the begining and put the parts that need x lvl to be upgraded on grey or something so you can see how it will work early and avoid confusion later on.
OP here. For the record, my Samurai is level 80. I don't see any tooltips that indicate positionals. I can be a bit absent minded though, so if anyone can point out which specific tooltips show the rear or flank requirements it would really put my mind at ease lol.
We do have them but I always just forget/ignore them. Unlike Monk and Dragoon, us Sam bois don't really need to worry about them unless we try harding.
They don't help much so in most content it doesn't make sense to worry if you miss any or all of them.