Say for example I make PHBI fighter, and I want one of the knight or slayer 1st level stances.
I cannot get them.
Boohoo, you can't take Cleaving Stance so I guess you'll have to suffer with... Cleave.
I offer you an emphatic MEH.
Boohoo, you can't take Cleaving Stance so I guess you'll have to suffer with... Cleave. Which works out to have the same effect in over 95% of cases. Same with Reaping Stance and Reaping Strike, etc. etc. etc..

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.