I felt like posting a general reply to the complainers, since the same arguments are being used towards this mechanic, as Quicksilver Bullets in Bloodborne.
Throughout a stage, killing enemies naturally replenishes your Emblem uses, giving you a higher surplus than what you normally use.
Unless you actually find yourself chewing through your entire stock while going through a stage - such as an overreliance on Sabimaru in the early game, or spamming Firecrackers, or Lazulite Axe spins.
And the amount of Sen you get *also* increases in areas, as the games go on, in tandem with the Spirit Emblem prices - after you have defeated certain bosses
I believe I'm right to say it's just baddies blaming mechanics design (specifically limited so as to not be exploited) for why they find themselves at zero item stock.
Rightfully punished for being bad.
I have no problem calling it as I see it.
If the game allowed you to infinitely spam Okinaga's Flame and spinning axes, completely trivializing some enemies, they'd find a way to complain about that too.
It's never supposed to be your main tool of attack, it's entirely supplemental.